diff --git a/src/App.vue b/src/App.vue
index 9306f83..3b5fe3d 100644
--- a/src/App.vue
+++ b/src/App.vue
@@ -31,6 +31,7 @@ const floorY = computed(() => Math.floor(y.value))
 const tx = computed(() => (x.value - floorX.value) * -BLOCK_SIZE)
 const ty = computed(() => (y.value - floorY.value) * -BLOCK_SIZE)
 const rows = computed(() => level.grid(floorX.value, floorY.value))
+const lightBarrier = computed(() => level.sunLight(floorX.value))
 
 const arriving = ref(true)
 const walking = ref(false)
@@ -125,10 +126,24 @@ const move = (thisTick: number): void => {
   lastTick = thisTick
 }
 
+function calcBrightness(level: number, row: number) {
+  const barrier = lightBarrier.value[row]
+  let delta = barrier - level - (floorY.value - 3)
+
+  if (delta > 3) delta = 3
+  else if (delta < 0) delta = 0
+
+  return `sun-${delta}`
+}
+
 onMounted(() => {
   lastTick = performance.now()
   move(lastTick)
 })
+
+function log(...args: any[]) {
+  console.log(...args)
+}
 </script>
 
 <template>
@@ -136,7 +151,10 @@ onMounted(() => {
 
     <div id="blocks" :style="{transform: `translate(${tx}px, ${ty}px)`}">
       <template v-for="(row, y) in rows">
-        <div v-for="(block, x) in row" class="block" :class="[block.type]" />
+        <div v-for="(block, x) in row"
+          :class="['block', block.type, calcBrightness(y, x)]"
+          @click="log('block', x, y, block.type)"
+        />
       </template>
     </div>
 
diff --git a/src/assets/field.css b/src/assets/field.css
index 459a690..de4ac63 100644
--- a/src/assets/field.css
+++ b/src/assets/field.css
@@ -1,39 +1,3 @@
-.block.grass   { background-image: url(/Tiles/dirt_grass.png); }
-
-.block.treeTopLeft     { background-image: url(/Tiles/leaves_transparent.png); }
-.block.treeTopMiddle   { background-image: url(/Tiles/leaves_transparent.png); }
-.block.treeTopRight    { background-image: url(/Tiles/leaves_transparent.png); }
-
-.block.treeCrownLeft   { background-image: url(/Tiles/leaves_transparent.png); }
-.block.treeCrownMiddle { background-image: url(/Tiles/leaves_transparent.png); }
-.block.treeCrownRight  { background-image: url(/Tiles/leaves_transparent.png); }
-
-.block.treeTrunkLeft   { background-image: url(/Tiles/leaves_transparent.png); }
-.block.treeTrunkMiddle { background-image: url(/Tiles/trunk_mid.png); }
-.block.treeTrunkRight  { background-image: url(/Tiles/leaves_transparent.png); }
-
-.block.treeRootLeft    { background-image: url(/Tiles/tree_root_left.png); }
-.block.treeRootMiddle  { background-image: url(/Tiles/trunk_bottom.png); }
-.block.treeRootRight   { background-image: url(/Tiles/tree_root_right.png); }
-
-.block.soil         { background-image: url(/Tiles/dirt.png); }
-.block.soilGravel  { background-image: url(/Tiles/gravel_dirt.png); }
-.block.stoneGravel { background-image: url(/Tiles/gravel_stone.png); }
-.block.stone        { background-image: url(/Tiles/stone.png); }
-.block.bedrock      { background-image: url(/Tiles/greystone.png); }
-.block.cave         { background-color: #000; }
-#field .block:hover { outline: 1px solid white; z-index: 10; }
-
-.morning0 .block, .morning0 #player { filter: saturate(50%) brightness(0.6) hue-rotate(-10deg); }
-.morning1 .block, .morning1 #player { filter: saturate(100%) brightness(0.8) hue-rotate(-20deg); }
-.morning2 .block, .morning2 #player { filter: saturate(200%) hue-rotate(-30deg); }
-
-.evening0 .block, .evening0 #player { filter: brightness(0.8) hue-rotate(-10deg); }
-.evening1 .block, .evening1 #player { filter: brightness(0.6) hue-rotate(-20deg); }
-.evening2 .block, .evening2 #player { filter: brightness(0.4) hue-rotate(-10deg) saturate(50%); }
-
-.night .block, .night #player { filter: brightness(0.3) saturate(30%); }
-
 .block {
   flex: 0 0 auto;
   width: var(--block-size);
@@ -43,6 +7,60 @@
   background-position: center;
   background-repeat: no-repeat;
 }
+
+.block.grass   { background-image: url(/Tiles/dirt_grass.png); }
+
+.block.treeCrown, .block.treeLeaves { background-image: url(/Tiles/leaves_transparent.png); }
+.block.treeTrunk { background-image: url(/Tiles/trunk_mid.png); }
+.block.treeRoot  { background-image: url(/Tiles/trunk_bottom.png); }
+
+.block.soil         { background-image: url(/Tiles/dirt.png); }
+.block.soilGravel  { background-image: url(/Tiles/gravel_dirt.png); }
+.block.stoneGravel { background-image: url(/Tiles/gravel_stone.png); }
+.block.stone        { background-image: url(/Tiles/stone.png); }
+.block.bedrock      { background-image: url(/Tiles/greystone.png); }
+.block.cave         { background-color: #000; }
+#field .block:hover { outline: 1px solid white; z-index: 10; }
+
+.block.sun-3 { filter: brightness(1.0); }
+.block.sun-2 { filter: brightness(0.4); }
+.block.sun-1 { filter: brightness(0.2); }
+.block.sun-0 { filter: brightness(0.0); }
+
+.morning0 .block, .morning0 #player {filter: saturate(50%) brightness(0.6) hue-rotate(-10deg); }
+.morning1 .block, .morning1 #player { filter: saturate(100%) brightness(0.8) hue-rotate(-20deg); }
+.morning2 .block, .morning2 #player { filter: saturate(200%) hue-rotate(-30deg); }
+
+.morning0 .block.sun-2 { filter: brightness(0); }
+.morning1 .block.sun-2 { filter: saturate(100%) brightness(0.2) hue-rotate(-20deg); }
+.morning2 .block.sun-2 { filter: saturate(200%) brightness(0.4) hue-rotate(-30deg); }
+
+.morning0 .block.sun-1,
+.morning1 .block.sun-1 { filter: brightness(0); }
+.morning2 .block.sun-1 { filter: saturate(200%) brightness(0.2) hue-rotate(-30deg); }
+
+.evening0 .block, .evening0 #player { filter: brightness(0.8) hue-rotate(-10deg); }
+.evening1 .block, .evening1 #player { filter: brightness(0.6) hue-rotate(-20deg); }
+.evening2 .block, .evening2 #player { filter: brightness(0.4) hue-rotate(-10deg) saturate(50%); }
+
+.evening0 .block.sun-2 { filter: brightness(0.3) hue-rotate(-10deg); }
+.evening1 .block.sun-2 { filter: brightness(0.2) hue-rotate(-20deg); }
+.evening2 .block.sun-2 { filter: brightness(0); }
+
+.evening0 .block.sun-1 { filter: brightness(0.2) hue-rotate(-10deg); }
+.evening1 .block.sun-1, .evening2 .block.sun-1 { filter: brightness(0); }
+
+.night .block, .night #player { filter: brightness(0.3) saturate(30%); }
+
+.block.sun-0,
+.morning0 .block.sun-0,
+.morning1 .block.sun-0,
+.morning2 .block.sun-0,
+.evening0 .block.sun-0,
+.evening1 .block.sun-0,
+.evening2 .block.sun-0,
+.night .block.sun-0 { filter: brightness(0); }
+
 #blocks {
   position: absolute;
   top: calc(var(--block-size) * (var(--spare-blocks) / -2));
diff --git a/src/level/blockExt.ts b/src/level/blockExt.ts
index e2fc73b..0bb8401 100644
--- a/src/level/blockExt.ts
+++ b/src/level/blockExt.ts
@@ -1,43 +1,50 @@
 import type { NoiseFunction2D } from 'simplex-noise'
 import {blockTypes as T, level as L, probability as P, type Block} from './def'
 
+const TREE_ROOT = [T.treeRootLeft, T.treeRootMiddle, T.treeRootRight]
+
 function trees(r: number, i: number, row: Block[], previousRow: Block[]) {
   const max = row.length - 1
   const h = i - 1
   const j = i + 1
+  const current = row[i]
+  const above = previousRow[i]
+  const aboveLeft = previousRow[h]
+  const aboveRight = previousRow[j]
 
-  if (row[i] === T.treeTopMiddle) {
-    if (i) {
-      if (row[h] === T.treeTopRight) row[h] = T.treeTopLeftMixed
-      else row[h] = T.treeTopLeft
-    }
-    if (i < max) row[j] = T.treeTopRight
+  if (current === T.treeCrown) {
+    if (i > 0) row[h] = T.treeLeaves
+    if (i < max) row[j] = T.treeLeaves
 
-  } else if (previousRow[i] === T.treeTopMiddle) {
-    row[i] = T.treeCrownMiddle
-    if (i) {
-      if (row[h] === T.treeCrownRight) row[h] = T.treeCrownLeftMixed
-      else row[h] = T.treeCrownLeft
-    }
-    if (i < max) row[j] = T.treeCrownRight
-  } else if (previousRow[i] === T.treeCrownMiddle) {
-    row[i] = T.treeTrunkMiddle
-    if (i) {
-      if (row[h] === T.treeTrunkRight) row[h] = T.treeTrunkLeftMixed
-      else row[h] = T.treeTrunkLeft
-    }
-    if (i < max) row[j] = T.treeTrunkRight
-  } else if (previousRow[i] === T.treeTrunkMiddle) {
-    row[i] = T.treeRootMiddle
-    if (i) {
-      if (row[h] === T.treeRootRight) row[h] = T.treeRootLeftMixed
-      else row[h] = T.treeRootLeft
-    }
-    if (i < max) row[j] = T.treeRootRight
+  } else if (above === T.treeCrown) {
+    row[i] = T.treeLeaves
+    if (i > 0) row[h] = T.treeLeaves
+    if (i < max) row[j] = T.treeLeaves
+
+  } else if (above === T.treeLeaves && aboveLeft === T.treeLeaves && aboveRight === T.treeLeaves) {
+    row[i] = T.treeTrunk
+    if (i > 0) row[h] = T.treeLeaves
+    if (i < max) row[j] = T.treeLeaves
+
+  } else if (above === T.treeTrunk) {
+    if (current === T.air) row[i] = T.treeTrunk
+    else row[i] = T.treeRoot
+  } else if (above === T.treeRoot) {
+    row[i] = T.soil
+    if (i > 0) row[h] = T.treeRoot
+    if (i < max) row[j] = T.treeRoot
   }
 }
 
-function ground(r: number, i: number, row: Block[], previousRow: Block[]) {
+function ground(r: number, i: number, current: Block, above: Block) {
+  if (above === T.air) {
+    if (r < P.soilHole) return T.air
+    if (current === T.soil) return T.grass
+  }
+  return current
+}
+
+function ground_(r: number, i: number, row: Block[], previousRow: Block[]) {
   const rootParts = [T.treeRootLeft, T.treeRootMiddle, T.treeRootRight]
   const prevBlock = previousRow[i]
 
@@ -49,25 +56,39 @@ function ground(r: number, i: number, row: Block[], previousRow: Block[]) {
   }
 }
 
-function rock(r: number, i: number, row: Block[], previousRow: Block[]) {
-  if (previousRow[i] === T.soil && r < P.fray) row[i] = T.soil
+function rock(r: number, i: number, current: Block, above: Block) {
+  if (above === T.soil && r < P.fray) return T.soil
+  return current
 }
 
-function underground(r: number, i: number, row: Block[], previousRow: Block[]) {
-  if (previousRow[i] === T.stone && r < P.fray) row[i] = T.stone
+function underground(r: number, i: number, current: Block, above: Block) {
+  if (above === T.stone && r < P.fray) return T.stone
+  return current
 }
 
 export default function createBlockExtender(rand: NoiseFunction2D) {
-  function extendBlocks(level: number, column: number, row: Block[], previousRow: Block[]) {
-    for (let i = 0; i < row.length; i++) {
-      const r = rand(level, column + i)
+  function growTrees(level: number, column: number, offset: number, row: Block[], previousRow: Block[]) {
+    const r = rand(level, column + offset)
+    trees(r, column, row, previousRow)
+  }
 
-      if (level < L.ground) trees(r, i, row, previousRow)
-      else if (level < L.rock) ground(r, i, row, previousRow)
-      else if (level < L.underground) rock(r, i, row, previousRow)
-      else underground(r, i, row, previousRow)
+  function extendBlock(level: number, column: number, offset: number, current: Block, above: Block) {
+    const r = rand(level, column + offset)
+
+    if (level < L.rock) return ground(r, column, current, above)
+    if (level < L.underground) return rock(r, column, current, above)
+    return underground(r, column, current, above)
+  }
+
+  function extendRow(level: number, columnOffset: number, row: Block[], previousRow: Block[]) {
+    for (let column = 0; column < row.length; column++) {
+      if (level < L.ground) {
+        // growTrees(level, column, columnOffset, row, previousRow)
+      } else {
+        row[column] = extendBlock(level, column, columnOffset, row[column], previousRow[column])
+      }
     }
   }
 
-  return extendBlocks
+  return { extendBlock, extendRow }
 }
diff --git a/src/level/blockGen.ts b/src/level/blockGen.ts
index f7c27b9..badb071 100644
--- a/src/level/blockGen.ts
+++ b/src/level/blockGen.ts
@@ -5,9 +5,7 @@ export default function createBlockGenerator(rand: NoiseFunction2D) {
   // randomly generate a block
   // level: number, smaller is "higher"
   // column: number, the x-axis
-  // before: Block, the block type left of (before) this block
-  // above: Block, the block type above this block
-  const generateBlock = (level: number, column: number, before: Block, above: Block): Block => {
+  const generateBlock = (level: number, column: number): Block => {
     // no randomness needed, there is always air above the trees
     if (level < L.treeTop) return T.air
 
@@ -15,7 +13,7 @@ export default function createBlockGenerator(rand: NoiseFunction2D) {
 
     // Air layer: mostly air, sometimes trees
     if (level < L.ground) {
-      if (level === L.treeTop && r < P.tree) return T.treeTopMiddle
+      if (level === L.treeTop && r < P.tree) return T.treeCrown
       return T.air
     }
 
@@ -40,11 +38,11 @@ export default function createBlockGenerator(rand: NoiseFunction2D) {
     return T.bedrock
   }
 
-  const fillRow = (level: number, column: number, row: Block[], previousRow: Block[]) => {
+  const fillRow = (level: number, column: number, row: Block[]) => {
     for (let i = 0; i < row.length; i++) {
-      row[i] = generateBlock(level, column + i, row[i - 1], previousRow[i])
+      row[i] = generateBlock(level, column + i)
     }
   }
 
-  return fillRow
+  return { fillRow, generateBlock }
 }
diff --git a/src/level/def.ts b/src/level/def.ts
index a723ed6..f40bd93 100644
--- a/src/level/def.ts
+++ b/src/level/def.ts
@@ -12,48 +12,28 @@ export type Block = {
   hp: number,
   walkable: boolean,
   climbable?: boolean,
+  transparent?: boolean,
 }
 
 export const blockTypes: Record<string, Block> = {
-  air: { type: 'air', hp: Infinity, walkable: true },
+  air: { type: 'air', hp: Infinity, walkable: true, transparent: true },
   grass: { type: 'grass', hp: 1, walkable: false },
 
-  treeTopLeft: { type: 'treeTopLeft', hp: 5, walkable: true },
-  treeTopMiddle: { type: 'treeTopMiddle', hp: 5, walkable: true },
-  treeTopRight: { type: 'treeTopRight', hp: 5, walkable: true },
-
-  treeCrownLeft: { type: 'treeCrownLeft', hp: 5, walkable: true },
-  treeCrownMiddle: { type: 'treeCrownMiddle', hp: 5, walkable: true, climbable: true },
-  treeCrownRight: { type: 'treeCrownRight', hp: 5, walkable: true },
-
-  treeTrunkLeft: { type: 'treeTrunkLeft', hp: 5, walkable: true },
-  treeTrunkMiddle: { type: 'treeTrunkMiddle', hp: 5, walkable: true, climbable: true },
-  treeTrunkRight: { type: 'treeTrunkRight', hp: 5, walkable: true },
-
-  treeRootLeft: { type: 'treeRootLeft', hp: 5, walkable: true },
-  treeRootMiddle: { type: 'treeRootMiddle', hp: 5, walkable: true, climbable: true },
-  treeRootRight: { type: 'treeRootRight', hp: 5, walkable: true },
-
-  treeTopLeftMixed: { type: 'treeTopLeftMixed', hp: 5, walkable: true },
-  treeCrownLeftMixed: { type: 'treeCrownLeftMixed', hp: 5, walkable: true },
-  treeTrunkLeftMixed: { type: 'treeTrunkLeftMixed', hp: 5, walkable: true },
-  treeRootLeftMixed: { type: 'treeRootLeftMixed', hp: 5, walkable: true },
-
-  treeTopRightMixed: { type: 'treeTopRightMixed', hp: 5, walkable: true },
-  treeCrownRightMixed: { type: 'treeCrownRightMixed', hp: 5, walkable: true },
-  treeTrunkRightMixed: { type: 'treeTrunkRightMixed', hp: 5, walkable: true },
-  treeRootRightMixed: { type: 'treeRootRightMixed', hp: 5, walkable: true },
+  treeCrown: { type: 'treeCrown', hp: 5, walkable: true, transparent: true },
+  treeLeaves: { type: 'treeLeaves', hp: 5, walkable: true, transparent: true },
+  treeTrunk: { type: 'treeTrunk', hp: 15, walkable: true, climbable: true, transparent: true },
+  treeRoot: { type: 'treeRoot', hp: 15, walkable: true, climbable: true },
 
   soil: { type: 'soil', hp: 2, walkable: false },
   soilGravel: { type: 'soilGravel', hp: 5, walkable: false },
   stoneGravel: { type: 'stoneGravel', hp: 5, walkable: false },
   stone: { type: 'stone', hp: 10, walkable: false },
   bedrock: { type: 'bedrock', hp: 25, walkable: false },
-  cave: { type: 'cave', hp: Infinity, walkable: true },
+  cave: { type: 'cave', hp: Infinity, walkable: true, transparent: true },
 }
 
 export const level = {
-  treeTop: 10,
+  treeTop: 9,
   ground: 14,
   rock: 16,
   underground: 24,
@@ -61,7 +41,7 @@ export const level = {
 }
 
 export const probability = {
-  tree: 0.2,
+  tree: 0.3,
   soilHole: 0.3,
   soilGravel: 0.2,
   stoneGravel: 0.1,
diff --git a/src/level/index.ts b/src/level/index.ts
index 5efc75d..df3b84a 100644
--- a/src/level/index.ts
+++ b/src/level/index.ts
@@ -5,12 +5,19 @@ import createBlockExtender from './blockExt'
 
 import {blockTypes as T, level as L, type Block} from './def'
 
-export default function createLevel(width: number, height: number, seed = 'very random seed') {
+const MAX_LIGHT = 100 // maximum level where light shines
+
+export default function createLevel(width: number, height: number, seed = 'extremely random seed') {
   const prng = alea(seed)
   const noise2D = createNoise2D(prng)
   const rand: NoiseFunction2D = (x, y) => 0.5 + 0.5 * noise2D(x, y)
 
+  // stores the current grid of blocks, visible on the screen
   const _grid: Block[][] = new Array(height)
+  // stores the limit to where light still shines,
+  // for each column currently visible on the screen
+  const _lightBarrier: number[] = [...new Array(width)].map(() => MAX_LIGHT)
+
   const blockGen = createBlockGenerator(rand)
   const blockExt = createBlockExtender(rand)
 
@@ -19,23 +26,45 @@ export default function createLevel(width: number, height: number, seed = 'very
     // TODO
   }
 
+  function calcLightBarrier(columnOffset: number) {
+    let previousBlock: Block = T.air
+
+    for (let col = 0; col < width; col++) {
+      for (let level = 0; level < MAX_LIGHT; level++) {
+        let block = blockGen.generateBlock(level, col + columnOffset)
+        block = blockExt.extendBlock(level, col, columnOffset, block, previousBlock)
+        previousBlock = block
+
+        if (!block.transparent) {
+          _lightBarrier[col] = level
+          break
+        }
+      }
+    }
+  }
+
   function generate(column: number, y: number) {
     for (let i = 0; i < height; i++) {
       const level = y+i
       const row: Block[] = Array(width)
       const previousRow = i ? _grid[i-1] : [] as Block[]
 
-      blockGen(level, column, row, previousRow)
-      blockExt(level, column, row, previousRow)
+      blockGen.fillRow(level, column, row)
+      blockExt.extendRow(level, column, row, previousRow)
 
       _grid[i] = row
     }
   }
 
+  function sunLight(x: number, y: number) {
+    calcLightBarrier(x)
+    return _lightBarrier
+  }
+
   function grid(x: number, y: number) {
     generate(x, y)
     return _grid
   }
 
-  return { grid, change }
+  return { grid, sunLight, change }
 }
diff --git a/src/vite-env.d.ts b/src/vite-env.d.ts
index 1fb925e..ef87b58 100644
--- a/src/vite-env.d.ts
+++ b/src/vite-env.d.ts
@@ -13,6 +13,7 @@ declare global {
     name: string
     type: string
     icon: string
+    amount: number
     quality?: 'bronze' | 'iron' | 'silver' | 'gold' | 'diamond'
   }