Lights Out is a minimalist platformer with one brilliant constraint: the level is completely dark, you can light it up by holding a button, and you cannot move while the light is on. So the game is memorise in the dark, move in the light — except it's the other way round, and that inversion is the whole design.
Hold the light too long and you lose, so every level becomes a series of short glances followed by blind runs. Each world adds a new mechanic — spikes, keys, moving platforms — that has to be handled from memory.
You can see or move, but never both. Holding the light reveals the level and freezes you in place; moving means doing it blind from memory.
It's the game's pressure valve — without a limit you could just study every level indefinitely, so the light is a resource as much as a tool.
Yes — tap the circle button to light up, and the on-screen arrows to move.