diff --git a/fcore/game-type.sml b/fcore/game-type.sml
index 0cf9032..f250866 100644
--- a/fcore/game-type.sml
+++ b/fcore/game-type.sml
@@ -2,6 +2,8 @@ signature GAME_TYPE =
 sig
   type wall = {id: int, x: int, y: int, width: int, height: int}
 
+  type platform = {id: int, x: int, y: int, width: int}
+
   datatype player_y_axis =
     ON_GROUND
   | FALLING
@@ -19,7 +21,13 @@ sig
     , jumpPressed: bool
     }
 
-  type game_type = {player: player, walls: wall vector, wallTree: QuadTree.t}
+  type game_type =
+    { player: player
+    , walls: wall vector
+    , wallTree: QuadTree.t
+    , platforms: platform vector
+    , platformTree: QuadTree.t
+    }
 
   val initial: game_type
 end
@@ -28,6 +36,9 @@ structure GameType :> GAME_TYPE =
 struct
   type wall = {id: int, x: int, y: int, width: int, height: int}
 
+  (* all platforms have a fixed visual height and a fixed collision height *)
+  type platform = {id: int, x: int, y: int, width: int}
+
   datatype player_y_axis =
     ON_GROUND
   | FALLING
@@ -45,7 +56,13 @@ struct
     , jumpPressed: bool
     }
 
-  type game_type = {player: player, walls: wall vector, wallTree: QuadTree.t}
+  type game_type =
+    { player: player
+    , walls: wall vector
+    , wallTree: QuadTree.t
+    , platforms: platform vector
+    , platformTree: QuadTree.t
+    }
 
   val initial: game_type =
     let
@@ -61,10 +78,18 @@ struct
       val wall1 = {id = 1, x = 0, y = 0, width = 100, height = 1080}
       val wall2 = {id = 2, x = 1820, y = 0, width = 100, height = 1080}
       val wall3 = {id = 3, x = 0, y = 980, width = 1920, height = 108}
-      val wall4 = {id = 4, x = 155, y = 911, width = 155, height = 55}
-      val walls = Vector.fromList [wall1, wall2, wall3, wall4]
+      val walls = Vector.fromList [wall1, wall2, wall3]
       val wallTree = Wall.generateTree walls
+
+      val plat1 = {id = 1, x = 155, y = 911, width = 155}
+      val platforms = Vector.fromList [plat1]
+      val platformTree = Platform.generateTree platforms
     in
-      {player = player, walls = walls, wallTree = wallTree}
+      { player = player
+      , walls = walls
+      , wallTree = wallTree
+      , platforms = platforms
+      , platformTree = platformTree
+      }
     end
 end
diff --git a/fcore/game-update.sml b/fcore/game-update.sml
index 70f786e..a9ccb75 100644
--- a/fcore/game-update.sml
+++ b/fcore/game-update.sml
@@ -2,9 +2,14 @@ structure GameUpdate =
 struct
   fun update (game, input) =
     let
-      val {player, walls, wallTree} = game
+      val {player, walls, wallTree, platforms, platformTree} = game
       val player = Player.move (game, input)
     in
-      {player = player, walls = walls, wallTree = wallTree}
+      { player = player
+      , walls = walls
+      , wallTree = wallTree
+      , platforms = platforms
+      , platformTree = platformTree
+      }
     end
 end
diff --git a/fcore/platform.sml b/fcore/platform.sml
new file mode 100644
index 0000000..b70717b
--- /dev/null
+++ b/fcore/platform.sml
@@ -0,0 +1,94 @@
+structure Platform =
+struct
+  (* collision height of a platform.
+   * Visual height may (and probably will) be different. *)
+  val platHeight = 3
+  val rPlatHeight = 3.0
+
+  fun helpGenerateTree (pos, platVec, acc) =
+    if pos = Vector.length platVec then
+      acc
+    else
+      let
+        val {id, x, y, width} = Vector.sub (platVec, pos)
+        val acc = QuadTree.insert
+          (x, y, width, platHeight, 0, 0, 1920, 1080, id, acc)
+      in
+        helpGenerateTree (pos + 1, platVec, acc)
+      end
+
+  fun generateTree platVec = helpGenerateTree (0, platVec, QuadTree.empty)
+
+  fun helpGetDrawVecWider
+    (pos, platVec, acc, winWidth, winHeight, ratio, yOffset) =
+    if pos = Vector.length platVec then
+      Vector.concat acc
+    else
+      let
+        val plat = Vector.sub (platVec, pos)
+        val {x, y, width, id = _} = plat
+
+        val x = Real32.fromInt x * ratio
+        val y = Real32.fromInt y * ratio + yOffset
+
+        val width = Real32.fromInt width * ratio
+        val height = rPlatHeight * ratio
+
+        val block = Block.lerp
+          (x, y, width, height, winWidth, winHeight, 0.0, 0.0, 0.0)
+        val acc = block :: acc
+      in
+        helpGetDrawVecWider
+          (pos + 1, platVec, acc, winWidth, winHeight, ratio, yOffset)
+      end
+
+  fun helpGetDrawVecTaller
+    (pos, platVec, acc, winWidth, winHeight, ratio, xOffset) =
+    if pos = Vector.length platVec then
+      Vector.concat acc
+    else
+      let
+        val plat = Vector.sub (platVec, pos)
+        val {x, y, width, id = _} = plat
+
+        val x = Real32.fromInt x * ratio + xOffset
+        val y = Real32.fromInt y * ratio
+
+        val width = Real32.fromInt width * ratio
+        val height = rPlatHeight * ratio
+
+        val block = Block.lerp
+          (x, y, width, height, winWidth, winHeight, 0.0, 0.0, 0.0)
+        val acc = block :: acc
+      in
+        helpGetDrawVecTaller
+          (pos + 1, platVec, acc, winWidth, winHeight, ratio, xOffset)
+      end
+
+  fun getDrawVec (platVec, width, height) =
+    let
+      val wratio = width / 1920.0
+      val hratio = height / 1080.0
+    in
+      if wratio < hratio then
+        let
+          val scale = 1080.0 * wratio
+          val yOffset =
+            if height > scale then (height - scale) / 2.0
+            else if height < scale then (scale - height) / 2.0
+            else 0.0
+        in
+          helpGetDrawVecWider (0, platVec, [], width, height, wratio, yOffset)
+        end
+      else
+        let
+          val scale = 1920.0 * hratio
+          val xOffset =
+            if width > scale then (width - scale) / 2.0
+            else if width < scale then (scale - width) / 2.0
+            else 0.0
+        in
+          helpGetDrawVecTaller (0, platVec, [], width, height, hratio, xOffset)
+        end
+    end
+end
diff --git a/oms.mlb b/oms.mlb
index acd9f56..100947f 100644
--- a/oms.mlb
+++ b/oms.mlb
@@ -10,6 +10,7 @@ in
 end
 
 fcore/wall.sml
+fcore/platform.sml
 fcore/game-type.sml
 
 fcore/player.sml