What it is. Any surface is climbable, but holding on spends stamina. The bar drains while you cling and climb, refills only when you stand on ground or a rest ledge. Run dry mid-face and you fall.

Player fantasy / why it’s fun. The whole cliff is yours — but not for free. Every ascent is a wager: can I reach that ledge before the meter empties? Freedom and dread in the same gesture. Breath of the Wild sold a generation on this exact tension.

The verb

Press toward a surface to grip; hold up to climb. You are always asking one question — “do I have enough left?”

How it feels / why it’s fun

• The cliff stops being geometry and becomes a route-planning puzzle solved in real time: which ledges to rest on, which overhang to sprint past.
• The meter converts a static wall into pacing — tension climbing, release at the ledge. See pattern-pacing-and-tension.
• Reading the surface for the cheapest path is skill that compounds. See pattern-mastery-and-flow and system-mastery-curve.
• It is a live pattern-risk-reward dial: the shortcut costs more stamina than the switchback, and you feel the price in your thumbs.

Tuning levers

Tune the warning band before anything else — a fall the player didn’t see coming reads as a lie, not a lesson. See pattern-fairness-and-trust and antipattern-input-lie.

Slots into

• Genres: genre-exploration, genre-metroidvania, genre-action-adventure, genre-survival-horror, and genre-precision-platformer when the meter replaces pure timing.
• Anchors: anchor-celeste (stamina on the wall-climb), anchor-shadow-of-mordor (climb-anywhere Nemesis fortresses), anchor-minecraft and anchor-terraria (climb as world-access verb).

Twist seams

• Climb but rain makes surfaces slick and stamina drains double (constraint) — weather rewrites the route mid-session; the safe face at noon is a death trap in a storm. Wire it through system-weather-and-time and system-hazards-and-environment; the player re-plans around pattern-pacing-and-tension.
• Climb but stamina is shared with your co-op partner (perspective) — one bar, two climbers; whoever pushes hard strands the other. Forces the ledge-swap negotiation of anchor-it-takes-two. See genre-coop-chaos and system-coop-and-competition.
• Climb but the bar is a currency you also spend on attacks (economy) — every swing is a rung you didn’t climb, so combat mid-face is a debt. Pull from system-resource-loops and system-economy.

For the machinery behind these, see process-the-twist.

How it wires to Hayao

• Stamina is one scalar in state that ticks each fixed step; drain and regen are deterministic functions of grip state and surface tag. Keep it in simulation state so it enters the world hash — the fall must be reproducible.
• Route the low-stamina flash/tremor through the cosmetic view layer so the cue never touches the hash. See the pause/timeScale and screen-shake wiring in the sandboxes/ labs for the pattern, not a game.
• The meter widget (bar, color ramp, warning pulse) is chrome — a system-inventory-and-ui concern, drawn cosmetic.
• Surface-slickness and weather multipliers belong in one lookup keyed by tag, so the rain twist is a data change, not new code.

Fails when…

• The bar never bites. If a full bar clears every intended face, stamina is decoration — cut it or shrink it. This is antipattern-false-depth.
• Falls feel unfair. No warning band, or regen so fiddly the player can’t plan → antipattern-rng-frustration by feel. See pattern-fairness-and-trust.
• Re-climbing is the punishment. A long slog back up after every miss is antipattern-backtracking-tax and antipattern-fail-loop-tax; add rest ledges and generous checkpoints (system-save-and-checkpoint, system-grace).
• Upgrades erase the meter. If system-progression hands out infinite stamina early, the mechanic dies at the exact moment it should deepen — antipattern-power-creep. Grow the walls, not just the bar.
• One optimal path. If the cheapest route is always obvious, planning collapses into antipattern-boring-optimal. Vary surface tags and ledge placement.

See also

• Traversal siblings: mechanic-ledge-grab, mechanic-wall-run, mechanic-wall-jump, mechanic-grapple, mechanic-glide.
• Systems: system-resource-loops, system-progression, system-map-and-navigation, system-accessibility (stamina-off toggle as a difficulty option — see system-difficulty-and-dda).
• Patterns: pattern-risk-reward, pattern-pacing-and-tension, pattern-mastery-and-flow.
• Process: process-core-loop, process-the-twist.