Lock 4 of 5

Bring every slider to its mark

Press the controls and watch what changes. Nothing here is explained: working out the hidden rule is the lock. The same press may not do the same thing twice.

1: at 0, mark 3

2: at 0, mark 5

3: at 0, mark 4

4: at 0, mark 4

Your progress saves on this device.

Stuck?

A nudge asks you a question instead of giving the rule. Three per lock, never counted against you.

New to this kind of lock? Try the warm-up.