Game

Celeste Classic

Maddy Thorson and Noel Berry's 2015 PICO-8 precision platformer.

stubUpdated 2026-10-22
On this page
  1. Related
  2. Mechanics
  3. References
  4. Sources

Maddy Thorson and Noel Berry’s precision platformer for the PICO-8 fantasy console was released in 2015 and later ported to C# and included with the 2018 Celeste. The atlas reads the C# port1. Like the main game, Celeste Classic uses a grace window after leaving a ledge1, but its grace counter counts 6 (5 airborne updates)1 updates. Inside Celeste, the port runs at 30 Hz2 Hz, half the main game’s rate, so its 5 airborne grace updates last about 0.17 s1,2. The game also implements jump-buffering with a buffer that stores presses for 4 updates3 updates3.

See also

Mentioned in

Mechanics

MechanicKindHow
Coyote timeGrace timera 6-update grace counter that refills on the ground
Jump bufferingUpdate countera 4-update counter stores presses and counts down until a jump starts
Every claim about this game, by concept (3)
Coyote timeCeleste Classic's grace counter resets to 6 on the ground and drops by 1 before each airborne jump check, so jumps work for 5 updates after leaving a ledge.Code
Inside Celeste, the Celeste Classic port skips every second frame to run at 30 Hz.Code
Jump bufferingCeleste Classic stores a fresh jump press in jbuffer for 4 updates, counts it down by 1 on later updates, and clears it when a normal or wall jump starts.Code

References

  1. ^ abcdCeleste Classic's grace counter resets to 6 on the ground and drops by 1 before each airborne jump check, so jumps work for 5 updates after leaving a ledge.CodeNoelFB/Celeste
    How we know
    233                if (on_ground)
⋮
235                    grace = 6;
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242                else if (grace > 0)
243                    grace--;
    Source/PICO-8/Classic.cs lines 233–243 at 1b0ce45 · upstream ↗
    297                    if (jbuffer > 0)
⋮
299                        if (grace > 0)
⋮
301                            // normal jump
⋮
304                            grace = 0;
    Source/PICO-8/Classic.cs lines 297–304 at 1b0ce45 · upstream ↗

    Checked against the evidence by its author, an AI model, 2026-10-20.

    Checked by a second AI model, 2026-10-27.

    In the claim ledger

  2. ^ abInside Celeste, the Celeste Classic port skips every second frame to run at 30 Hz.CodeNoelFB/Celesterevised
    How we know
    268            // this is a pretty dumb hack but because Celeste is locked to 60fps
269            // and PICO-8 runs at 30 ... we just skip every 2nd frame
⋮
271            skipFrame = !skipFrame;
272            if (skipFrame)
273                return;
    Source/PICO-8/Emulator.cs lines 268–273 at 1b0ce45 · upstream ↗

    Checked against the evidence by its author, an AI model, 2026-10-27.

    Revised after a check by a second AI model, 2026-10-27: Read in code, so T3; the 0.17 s belongs to grace-frames.

    In the claim ledger

  3. ^ abCeleste Classic stores a fresh jump press in jbuffer for 4 updates, counts it down by 1 on later updates, and clears it when a normal or wall jump starts.CodeNoelFB/Celeste
    How we know
    223                var jump = E.btn(G.k_jump) && !p_jump;
224                p_jump = E.btn(G.k_jump);
225                if (jump)
226                    jbuffer = 4;
227                else if (jbuffer > 0)
228                    jbuffer--;
    Source/PICO-8/Classic.cs lines 223–228 at 1b0ce45 · upstream ↗
    297                    if (jbuffer > 0)
⋮
299                        if (grace > 0)
⋮
301                            // normal jump
⋮
303                            jbuffer = 0;
⋮
308                        else
⋮
310                            // wall jump
⋮
312                            if (wall_dir != 0)
⋮
315                                jbuffer = 0;
    Source/PICO-8/Classic.cs lines 297–315 at 1b0ce45 · upstream ↗

    Checked against the evidence by its author, an AI model, 2026-10-22.

    Checked by a second AI model, 2026-10-27.

    In the claim ledger

Sources

Code