Series

Sonic the Hedgehog

1 games, 12 claims. Each cell lists the claims about that concept in that game; “uses” marks a game that has the concept but no claims yet.

Concept	Sonic the Hedgehog 1991
Coyote time	Sonic gets no grace window after leaving a ledge: only the grounded modes, `Sonic_MdNormal` and `Sonic_MdRoll`, call `Sonic_Jump`. T3
Gravity	`ObjectFall`'s gravity equate adds `$38` subpixels/frame to an airborne object's downward speed each frame, Sonic's included. T3 `ObjectFall` adds the pre-gravity speed, shifted left 8 bits, to the 32-bit position, so positions are 16.16 and speeds 8.8 fixed point. T3 Sonic 1 never caps falling speed in the air; with `FixBugs = 0`, `Sonic_JumpHeight`'s only cap is upward (`-$FC0`) and skipped after jumps. T3
Jump	Sonic's jump speed, `son_jumpspeed`, is `$680` subpixels per frame (6.5 px/frame) out of water. T3 `Sonic_Jump` adds the jump speed along the ground normal (`CalcSine` of angle − `$40`); on flat ground that is exactly `-$680` to Y speed, nothing to X. T3 Sonic doesn't move on the press frame; `Sonic_Jump` drops its return address, skipping the rest of the grounded routine, `SpeedToPos` included. T3 A standing jump curls Sonic up, shrinking his height radius from 19 to 14 and adding 5 to Y, so his feet stay put. T3
Variable jump height	During a jump, with no jump button held, `Sonic_JumpHeight` clamps any rise faster than 4 px/frame to exactly `-$400`. T3 Gravity slows Sonic's 6.5 px/frame take-off below the 4 px/frame release cap within 12 airborne updates. T4 In the airborne-rolling mode (`Sonic_MdJump2`), the release check runs before `ObjectFall` moves Sonic and adds gravity. T3 Simulating the jump code (flat ground, out of water) gives apexes of 39 px tapped and 100 px held, airtimes 39 and 62 frames. T4