Duplex
Land both mirrored tokens on their goals.↑↓←→
About Duplex
Duplex is a mirror puzzle where one input drives two tokens at once — You in blue, Echo in amber — and learning to pull them apart is the entire game. Press a direction and both move together, but Echo travels along the level's mirror axis, so it may head the opposite way, or off at right angles, or diagonally. The key insight, which the early levels teach gently, is that walls are your tool rather than your enemy: park one token against a wall and a shared press moves only its twin, breaking the symmetry lock that would otherwise keep them forever in lockstep. You collect the pellets and land both tokens on their goals to clear each of the seventeen hand-built levels, which span five different mirror axes, each introducing a new way the reflection misbehaves. Working backward from the goals and hunting the par-length solution for three stars is where the satisfaction sits — these are clean single-idea puzzles, not grinds. Free in the browser on desktop or mobile, it adds a fresh daily puzzle on top.
How to play
- Press an arrow key (or WASD, or swipe) and both tokens move at once — You in blue, Echo in amber.
- Echo moves along the level’s mirror axis, so it may travel the opposite way, or at right angles.
- A token blocked by a wall or edge stands still while its twin keeps going — that is how you break the symmetry lock.
- Collect the pellets and land both tokens on their goals to clear the level.
Strategy & tips
- Walls are the tool, not the obstacle. Park one token against a wall so a shared press moves only the other.
- Work backwards from the goals — figure out the final press, then what has to be true before it.
- Watch the move counter: match par to earn three stars, so hunt the shortest path rather than any path.
- On diagonal axes, think in terms of which press separates the tokens rather than which press advances one.
- If you are stuck, reset and replan. The levels are built around one clean idea, not long grinds.
FAQ
How do the two tokens move?
One press drives both. You steps the direction you pressed; Echo steps the direction the level’s mirror axis dictates — horizontal, vertical, point, diagonal or anti-diagonal.
How many levels are there?
17 hand-built levels across five mirror axes, each introducing a new way the reflection behaves — plus a fresh daily puzzle.
How do I get three stars?
Clear the level in par moves or fewer. Par is the shortest possible solution, so three stars means you found the optimal path.
Is Duplex free?
Yes — it plays free in your browser with no download or sign-up, on desktop and mobile.