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diff --git a/assets/sketch-checkpoints.jpg b/assets/sketch-checkpoints.jpg
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+++ b/assets/sketch-checkpoints.jpg
diff --git a/assets/sketch-enemy-menneke.jpg b/assets/sketch-enemy-menneke.jpg
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+++ b/assets/sketch-enemy-menneke.jpg
diff --git a/assets/sketch-enemy-terror-uil.jpg b/assets/sketch-enemy-terror-uil.jpg
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+++ b/assets/sketch-enemy-terror-uil.jpg
diff --git a/assets/sketch-enemy-ventje.jpg b/assets/sketch-enemy-ventje.jpg
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diff --git a/assets/sketch-level-horizontal.jpg b/assets/sketch-level-horizontal.jpg
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diff --git a/assets/sketch-level-vertical.jpg b/assets/sketch-level-vertical.jpg
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+++ b/assets/sketch-level-vertical.jpg
diff --git a/assets/sketch-platformer-elements.jpg b/assets/sketch-platformer-elements.jpg
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diff --git a/assets/sketch-player.jpg b/assets/sketch-player.jpg
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diff --git a/assets/sketch-regular-level.jpg b/assets/sketch-regular-level.jpg
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diff --git a/docs/gameplay.md b/docs/gameplay.md
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+++ b/docs/gameplay.md
@@ -0,0 +1,126 @@
+# Concept (Loek)
+
+## General gameplay
+
+- Platformer (similar platformer mechanics to Cuphead)
+- Focus on gameplay instead of story
+- Medium length levels
+- Horizontally (left to right), or vertically (both directions) scrolling
+  levels
+- Levels get progressively more difficult (like Hades)
+- Each level has a miniboss at the end
+- Levels are separated by a checkpoint room
+- Checkpoints don't have respawn points, but are like saferooms with a shop for
+  buying upgrades (like in Hades)
+- The player automatically shoots bullets as they walk
+- The player's score is determined by the distance travelled + bonus points for
+  various actions like defeating enemies
+
+## Player character & abilities
+
+![rough sketch of the game protagonist](../assets/sketch-player.jpg "medium")
+
+- Small guy with a hood and Fall guys eyes
+- Actions
+  - Jump (primary action button)
+  - Dash/attack (secondary action button) (upgradable -> [shop][shop])
+  - Movement (D-pad)
+  - Shooting (D-pad) (automatic rapid fire when holding direction)
+- Temporarily invulnerable when taking damage (with flashing animation like in
+  Super Mario Bros.)
+- 5 HP (by default) (upgradable -> [shop][shop])
+
+## Level design
+
+- Hatched zones in the following sketches indicate movement zones for the
+  player during a mini boss
+- Outside the movement zone, the player should take damage, but the player
+  should realize this intuitively
+- During the miniboss, the camera is locked past the dashed line so the player
+  can't escape by running away
+- The camera follows the player
+
+### Level flow
+
+![horizontal level flow](../assets/sketch-level-horizontal.jpg)
+
+- Horizontal level always flows from left to right
+- Level design in which the player has to "walk back" from right to left is
+  discouraged
+
+![vertical level flow](../assets/sketch-level-vertical.jpg)
+
+- Vertical levels can either flow from top to bottom, or bottom to top
+- Small sections of backtracking are allowed in the top to bottom vertical flow
+
+[shop]: #checkpoint-room-shop
+### Checkpoint room (shop)
+
+![checkpoint room](../assets/sketch-checkpoints.jpg)
+
+- Transition room between levels
+- Visible exit point is determined by the following level type
+  - Door on right side for horizontal level
+  - Nuclear bunker style hatch for vertical top-bottom level
+  - Ladder into black hole for vertical bottom-top level
+- Game starting screen is also a checkpoint room, but without a shop
+- Checkpoints don't act as reset points
+- Available upgrades
+  - HP boost
+  - Temporary status effects
+    - Jump boost
+    - Speed boost
+  - Different kinds of dashes (with tradeoffs)
+    - Regular dash (furthest distace, no special effects)
+    - Super punch (deals damage during dash, less distance)
+    - Smoke bomb (temporarily invulnerable and invisible, less distance)
+- Upgrades are purchased/unlocked only once per game
+- Switching to other dashes is only allowed in checkpoints
+
+### Regular level
+
+![regular level example](../assets/sketch-regular-level.jpg)
+
+- A: player
+- B: breakable
+- S: solid ground
+- E: enemy
+- 1: primary action
+- 2: secondary action
+
+## Enemy types
+
+The enemies aren't named in-game, so these names are either working names or
+internal names. All enemies deal 1 HP damage per hit.
+
+### Menneke
+
+![enemy type 1 "menneke"](../assets/sketch-enemy-menneke.jpg "small")
+
+- Runs around and jumps on platforms vaguely in the player's direction
+- Slightly slower than the player
+- 1 HP
+- Passive (damage on contact, but doesn't actively 'hunt' the player)
+- Low score bonus
+
+### Ventje
+
+![enemy type 2 "ventje"](../assets/sketch-enemy-ventje.jpg "small")
+
+- Runs at the player, but can't jump very high
+- Slightly slower than the player
+- Passive
+- 2 HP
+- Divides into smaller copies when defeated (like slimes from Minecraft)
+- Medium-low score bonus
+
+### Terror uil
+
+![enemy type 3 "terror uil"](../assets/sketch-enemy-terror-uil.jpg "small")
+
+- Roams around the top of the screen
+- Sometimes attacks player
+- 1 HP
+- Medium-high score bonus
+- Was on NOS Jeugdjournaal once
+
diff --git a/docs/gen/doc.m4 b/docs/gen/doc.m4
index 5719b54..b5edceb 100644
--- a/docs/gen/doc.m4
+++ b/docs/gen/doc.m4
@@ -3,6 +3,7 @@ define(`docname',
 	       NAME, `pve', `Pakket van eisen',
 	       NAME, `research', `Research document',
 	       NAME, `design', `Design document',
+	       NAME, `gameplay', `Game design document',
 				 `UNKNOWN???'))dnl
 
 <!DOCTYPE html>
diff --git a/docs/gen/style.css b/docs/gen/style.css
index 7179ded..a162289 100644
--- a/docs/gen/style.css
+++ b/docs/gen/style.css
@@ -106,4 +106,7 @@
 		display: block;
 		margin: 0 auto;
 	}
+
+  img[title="small"] { max-width: 5cm; }
+  img[title="medium"] { max-width: 8cm; }
 }