Level design

A level is a sequence of intentional experiences delivered through space. Good level design is a process: define the metrics movement is built on, block out geometry with primitives, play it, then dress it — never the reverse. This skill is the engine-neutral practice; use godot-tilemap/unity-tilemap-2d to lay out 2D grids and gridmaps for 3D.

When to use

• Use to plan a level's structure: critical path, pacing, gating, encounters, and where the player learns vs is tested.
• Use the blockout → test → iterate → dress workflow to build a level that plays well before any art exists.
• Use to derive level metrics from the character's movement so geometry is reachable and fair.

When not to use: to generate levels algorithmically, use procedural-gen (authored and procedural design are complementary). For the engine's tile/grid painting tools, use godot-tilemap / unity-tilemap-2d. For the movement abilities the metrics come from, that's the engine movement skill + input-systems.

Core workflow

1. Derive metrics first. Measure the character: max jump height and distance, run speed, reach, camera range. Every gap, ledge, and corridor is sized in these units. Lock them before building geometry.
2. Blockout (whitebox/greybox). Build the whole level from untextured primitives at correct scale. Validate flow, sightlines, and reachability while changes are cheap. No art yet.
3. Define the critical path (start → goal) and the golden path you expect most players to take. Layer optional/secret paths off it.
4. Pace the experience. Alternate tension and rest in a deliberate curve; don't run combat-combat-combat. Give the player room to breathe and to anticipate.
5. Teach, then test. Introduce each mechanic in a safe space, let the player practice, then test it under pressure. Difficulty rises in a sawtooth, not a straight line.
6. Gate with intent. Use locks/keys, abilities, and one-way drops to control order and pacing; guide with light, lines, and landmarks rather than walls.
7. Playtest and iterate. Watch real players: where do they get lost, stuck, bored, or killed unfairly? Fix the blockout; only dress when it plays well.

Patterns

1. Player metrics drive every dimension

# Measure the character ONCE, then size geometry in these units. If the jump
# changes, gaps must be re-derived — never eyeball reachability.
const RUN_SPEED      := 240.0   # px/s (or m/s in 3D)
const MAX_JUMP_H     := 96.0    # peak height of a full jump
const MAX_JUMP_DIST  := 200.0   # horizontal distance of a running jump
const SAFE_GAP       := MAX_JUMP_DIST * 0.7   # comfortable, not pixel-perfect
const HARD_GAP       := MAX_JUMP_DIST * 0.95  # a deliberate skill check
# Build platforms so required jumps use SAFE_GAP; reserve HARD_GAP for optional reward.

A reachable level falls out of honest metrics. A platform placed MAX_JUMP_DIST + 1 away is impossible; one at SAFE_GAP is fair. Keep these constants beside the level data so designers and code agree.

2. Encounter / pacing as data (a tension timeline)

# Author the level as a sequence of beats with an intended intensity (0..1).
# This makes the pacing curve explicit and reviewable before you build rooms.
const BEATS := [
    { "room": "entry",      "type": "teach",   "intensity": 0.1 },
    { "room": "hall_1",     "type": "combat",  "intensity": 0.5 },
    { "room": "vista",      "type": "rest",    "intensity": 0.1 },  # breather + reward
    { "room": "gauntlet",   "type": "combat",  "intensity": 0.8 },
    { "room": "save_room",  "type": "rest",    "intensity": 0.2 },  # before the boss
    { "room": "boss",       "type": "climax",  "intensity": 1.0 },
]
# Read the intensity column top-to-bottom: it should rise overall but dip for rests
# (a sawtooth), never flatline high. Drive spawns/music intensity from this.

3. Gating and the critical path (a small graph)

# Model the level as rooms + gated connections. Validate that the goal is
# reachable with the keys/abilities the player can actually obtain in order.
const ROOMS := {
    "entry":   { "exits": [ { "to": "hall_1" } ] },
    "hall_1":  { "exits": [ { "to": "vista", "needs": "double_jump" },
                            { "to": "side_room" } ] },           # optional branch
    "side_room": { "exits": [ { "to": "hall_1" } ], "grants": "double_jump" },
    "vista":   { "exits": [ { "to": "boss", "needs": "red_key" } ] },
}
# Validation (do this!): from "entry", can the player reach "boss" given that
# "double_jump" is granted in "side_room" before "vista" requires it? A flood
# fill that only traverses an exit when its `needs` is already satisfiable
# proves the critical path isn't soft-locked.

Pitfalls

• Dressing before it plays. Detailing a blockout you haven't validated wastes the most expensive work on a layout you'll change. Greybox and test first.
• Geometry that ignores metrics: gaps the jump can't clear, ledges below reach, corridors narrower than the camera needs. Size everything in player units.
• Flat pacing. Wall-to-wall combat (or wall-to-wall calm) numbs the player. Alternate tension and rest; place a breather and a save before the climax.
• Testing a mechanic before teaching it. Players meet a hazard for the first time in a lethal spot. Introduce safely, let them practice, then test.
• Soft-locks and dead ends. A gate needs an ability/key obtainable only past the gate. Validate the critical path's key/ability order, not just connectivity.
• No readability / guidance. Players get lost when nothing draws the eye. Use light, leading lines, color, and landmarks to point toward the path.
• One-way drops with no signposting strand or surprise players. Telegraph irreversible moves.
• Confusing procedural with authored. Generation gives variety, not authored pacing. Use procedural-gen for variety; hand-author for intent.

References

• references/pacing-and-flow.md — the difficulty/tension curve in depth, teaching-loop design (introduce→develop→twist→test), readability and guidance techniques, 2D vs 3D layout considerations, and a blockout review checklist.

Related skills

• godot-tilemap, unity-tilemap-2d — paint 2D level grids; gridmaps for 3D.
• procedural-gen — generate variety to complement authored structure.
• game-ai — encounter enemies that navigate the space you build.
• platformer, puzzle, roguelike — genres that compose this skill.