One Screen (SNES)

One Screen is a homebrew game for the Super Nintendo: a precision platformer where all 50 levels take place in the very same room. Grab the key, reach the door, and do it again under a new rule.

Same ledges. Same spikes. Same saw, bat and slime. But the floor turns to ice, gravity drops, the lights go out, the picture flips upside down, a shadow chases you. You only learn one map, and it never stops surprising you.

🧩 How to Play

• Touch the key, then walk into the door in the bottom right corner.
• Some levels also need every coin before the door opens.
• Spikes, the saw, the bat, the slime and the shadow are deadly. One touch and you restart the level.
• No lives, no game over: retry as often as you need. Only your death counter grows.
• The level name is your only hint about the rule.

🕹️ Controls

Button	Action
D-pad	Move
B or A	Jump (hold for higher)
START	Pause
B (menus)	Back

✨ Features

• 50 levels in 5 worlds, all in one room
• Over 20 rules: ice, low gravity, heavy boots, wind, bounce, swapped controls, mirror, upside down, lights out, ghost, flicker, timer, hot floor, no brakes, shadow, jump limit, red light and their combinations
• Original chiptune soundtrack and sound effects
• Battery save, level select and a death counter
• Hidden secrets to discover

💾 How to Run

.smc ROM, LoROM, 128 KB with battery save, NTSC. Tested in Snes9x and bsnes (also works in RetroArch with either core).

🏆 Achievements Suggestions

This is the suggested set. All of them can be earned in a single Story playthrough.

• Out of the Room — Clear World 1 in Story mode.
• Laws of Physics — Clear World 2 in Story mode.
• Seeing Is Believing — Clear World 3 in Story mode.
• Under Pressure — Clear World 4 in Story mode.
• One Screen — Clear all 50 levels in Story mode.
• Quick Learner — Clear level 1 in under 10 seconds.
• Untouched — Clear World 1 in Story mode without dying.
• Ice Cold — Clear Ice Floor (level 11) without dying.
• Featherweight — Clear Low Gravity (level 12) without dying.
• Night Vision — Clear Lights Out (level 22) without dying.
• Head Over Heels — Clear Total Confusion (level 24) without dying.
• Steady Hands — Clear World 3 in Story mode without dying.
• Beat the Clock — Clear Tick Tock (level 31) with 5 or more seconds left.
• Outrun Yourself — Clear Shadow (level 34) without dying.
• Six Shooter — Clear Six Jumps (level 35) without dying.
• Green Means Go — Clear Red Coins (level 40) without dying.
• Flawless Finale — Clear World 5 in Story mode without dying.
• Paper Trail (Easter Egg) — Some screens look better on paper.
• Still There? (Easter Egg) — Sometimes the best move is no move at all.

📝 Version

v1 — October 2026