Momentum Hill

Classic ground physics · Mania-inspired ability layer · 4:3 presentation

MOMENTUM ENGINE v3

Choose a Zone

One zone exists to break the physics. The other exists to make them sing.

Move: ← → / A D   Roll: ↓ / S   Jump: Z / Space
Spin dash: hold ↓, tap Jump, release ↓   Drop dash: jump, press and hold Jump again until landing

Physics, presentation, and legal note

The simulation runs at a fixed 60 Hz and retains the documented Sonic 1 constants and state distinctions for running, reversing, rolling, jumping, air drag, slope resistance, and wall detachment. The ability layer is deliberately hybrid: roll-jumps retain air steering, while the spin dash and drop dash use Sonic Mania-inspired rules. Version 3 adds a canonical 320×224 4:3 viewport and a dedicated instrumented test zone. All level geometry, graphics, names, sounds, and layouts are original placeholders inspired by the design language of 16-bit momentum platformers; no Sega sprites, music, maps, or ROM data are included.