Guide
How to Play Simon
Simon is OPKA's homage to the 1978 electronic memory game that turned four glowing color pads into an arcade icon. The machine flashes a sequence of pads, you echo it back, and every round replays the whole sequence with one new step added to the end. There is no finish line — the run simply keeps growing until a single wrong press ends it.
The OPKA table derives each game's pad sequence from a seed, so signed-in runs can be replayed and verified on the server before they rank. Your score is the number of rounds you completed, and because peeking would ruin the point, there is deliberately no undo: one mistake, one result.
How a round works
Press Start and watch: the pads light up one at a time, each with its own tone. When the playback ends it is your turn — press the same pads in the same order. Echo the whole sequence correctly and the round is complete.
The next round replays everything you just echoed plus one new pad at the end. Round 1 is a single pad, round 5 is five pads, and the playback gradually speeds up as your run gets longer.
- Four color pads: green, red, yellow, and blue, each with a distinct tone.
- Every round adds exactly one new step to the end of the sequence.
- One wrong press ends the run on the spot — there are no second chances.
Scoring
Your score is the number of rounds you completed before the miss. Fail on round 8 and you keep the 7 rounds you finished — the wrong press never takes away rounds already banked.
Simon is endless, so there is no won or lost game — only how far you got. Leaderboards rank the longest verified runs.
Why there is no undo
Rewinding a wrong echo would let you retry the same step with full knowledge of the sequence, which is the entire challenge. The OPKA table intentionally offers no undo, redo, or replay-the-sequence button: the run is a single unbroken test of memory, exactly like the original toy.