Start here
The chapters introduce one idea at a time. Follow the hand on the first sheets, then try it yourself. These twelve videos explain the controls and objects when you need a reminder.
Learn by watching
Start with sliding, then learn echoes, obstacles and the time controls. Choose a lesson below. Recorded in the game, one idea at a time, with narration and captions.
Lesson 1 of 12
Learn where a swipe stops and how to finish a puzzle.
Lesson 2 of 12
Use Wait to record a longer echo, inspect its ending and slide alongside it.
Lesson 3 of 12
Record a move and a Wait. Let your echo hold a door open while you take another path.
Lesson 4 of 12
Use the body of an echo to stop where you could not stop alone.
Lesson 5 of 12
Watch Undo reverse a move and Rewind keep your echoes. The lesson also explains Restart sheet in the menu.
Lesson 6 of 12
Preview the turns without making a move, then see how long a recorded echo stays on the board.
Lesson 7 of 12
Collect a shard, fork a run that ended in a fall, then reach the open core.
Lesson 8 of 12
See where light stops your slide before learning how to block it.
Lesson 9 of 12
See why a beam blocks the way and how an echo can keep a wired lamp off.
Lesson 10 of 12
Watch a floor break after you leave it. Plan who crosses and when.
Lesson 11 of 12
Watch a mirror turn a beam, and stop beside the light it bends.
Lesson 12 of 12
Make two recordings in sequence and use both echoes as stopping points.
Your first puzzles
The white robot is you. Slide into the open core to solve the sheet. The core glows when it is open; a lock means it is closed. If there are shards, you or your echoes must collect them all first. Some cores also need a plate to be held.
Swipe up, down, left or right on the board. You keep sliding until something stops you. You stop before walls, board edges, closed doors and echoes, or directly on a notch or plate. Before swiping, look for where you will stop.
You can think before every move: the game advances when you act. Every swipe and every Wait uses a turn, including a blocked swipe. Once you have echoes, they act in the order they were created, then you act. Wait keeps you in place while your echoes move.
On a puzzle that allows echoes, record a run and select Fork echo. Your actions become a recorded helper; the board resets and you begin a new run alongside it. An echo repeats your actions, not necessarily your original route. Your position and the state of doors can change where it stops.
Fork echo saves a new helper. Rewind clears your current run while keeping the echoes you already made. Undo reverses your last action. At the beginning of a run, Undo takes you back into the last echo’s recording so you can change it.
Tap Timeline to open the numbered lines, then press and drag on them. Press and drag along the Timeline to inspect earlier turns or see what would happen if you waited from now on. Release to return to the present. Previewing does not take a turn. Dotted routes also assume you wait; moving into an echo’s path can change the outcome.
On independent attempts, solving at par can earn three stars. A hint limits this sheet to two stars; seeing the answer limits it to one, including future replays. Previously earned stars stay. Chapter practice is timed from when the board is ready and pauses when you take a break. Online ranked time, when available, continues during pauses and in the background.
A plate holds its matching door open while someone stands on it. Light blocks movement, and bodies or closed doors can block its beam. In later puzzles, a thin floor becomes a hole when a body leaves it. Choose Watch how it works when a new rule appears to see it on a separate training board. A mirror is solid and turns a beam a quarter turn; the shadow of anyone standing in the beam turns with it.
Finish the core sheets of a chapter to continue. Using help does not stop a solved sheet from counting. Additional practice and challenge sheets can be revisited later. Sealed sheets can also open by finishing the other ordinary sheets in their chapter. Solve the whole book to open the drawer; three stars and flawless solves remain separate goals.
If you fall or run out of turns, use Undo or Restart sheet in the menu. Rewind retries a run while keeping echoes. A run that ended in a fall can still become an echo if you have a slot left. Return to the chapter map to continue or choose extra practice. Try a computer match or the Workshop when you want something different.
In the Echo, Plate and Door lesson, follow these five actions in order. After Fork echo, keep controlling your robot; the echo replays automatically. Other puzzles need their own sequence.
Swipe right onto plate a. The door opens, but you are the one holding it.
Wait one turn, so this run lasts long enough.
Fork echo: time starts again, and your past self will repeat that run.
Your echo walks to the plate. You go down.
Through the door your past self is holding, and into the core.
Keep this handy
Swipe to move. New controls appear as the chapters introduce them. Early sliding sheets keep the controls simple; Wait becomes available when timing is introduced.
Fork echoSave your current actions as an echo and begin again alongside it.
In the main controls, between Undo and Hints, when the sheet allows echoes.
WaitStay in place for one turn while the echoes act. Tap once to advance one turn. You do not need to wait in real time.
The hourglass in the secondary controls, when timing is introduced.
UndoReverse the last action for you and your echoes. At the start of a run, undoing can take back the last fork.
The curved arrow in the main controls.
RewindClear your current run and keep the echo recordings.
Open Timeline to reveal Rewind above the numbered lines.
Restart sheetStart the whole sheet again, clearing the current run and all echoes.
Open the three-line menu, then choose this row.
HintsOpen help for the sheet you are playing.
The light-bulb icon beside Fork echo.
Watch how it worksWatch a step-by-step demonstration when the sheet introduces a rule.
Open Hints, then choose the film-strip row when a lesson is available.
TimelineDrag along the lines to inspect earlier turns or preview what happens if you wait. Release to return. This takes no move.
Tap Timeline to open the numbered lines, then press and drag on them.
Read the board
The same symbols, names and descriptions as How to play in the game.
Swipe to slide. You keep going until something stops you.
Reach the open core to solve the sheet. It glows when open; a lock means it is closed.
Stops every slide, as does the edge of the sheet.
Falling in ends the run. Undo is always free.
Carries one crossing. The moment someone leaves it, it gives way and becomes a pit.
Anything sliding over it stops on it.
Every shard must be taken before the core opens. Anyone may take them.
Fork echo turns your run into a copy that repeats every swipe while you start again. Echoes are solid and last exactly as long as their run.
Stops slides. While someone stands on it, its door opens.
Solid while closed. No one can hold a door open for themselves.
Its light is a wall. Closed doors and anyone standing still cast a shadow.
Solid, like a wall. It turns a beam a quarter turn, and the shadow of anyone standing in the beam turns with it.
Each turn, the oldest echo moves first and you move last.
When something surprises you
A swipe keeps going until an obstacle or stopping point stops you. Plan around walls, notches, plates and the positions of echoes.
An echo disappears at the start of the turn after its last recorded action. Record extra Wait actions if you need it to stay for more turns.
Rewind retries your own run. Use Fork echo to save a new recording.
The total includes the actions saved in your echo recordings as well as the final run. Wait actions also count.
A hint was read on that sheet. With a hint the most is two stars; with the answer seen, one. Stars you had already earned on the sheet are kept.
Open Settings, Back up progress on either phone. Copy the code and paste it on the other phone, including between iPhone and Android. Import merges with existing progress. iCloud and Android system backups follow your account and device settings.
No. Replaying a result checks that the moves solve the puzzle. It cannot establish who played or whether they used outside help.
The early sheets show what to do, then leave the next step to you. Finish the core sheets to continue; extra practice and challenge sheets remain available.