Playing Prism Relay

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Read the goal first: its opening shows the side the last tile must connect from, so you know where the channel has to arrive.

Each board has one gap. Tap a tile that touches the gap, drag it in, or press an arrow key, and it slides into the gap; tiles never rotate. The cyan start and the violet goal are fixed. Rails joined to the start glow cyan and rails joined to the goal glow violet, so you can watch the channel grow from both ends. When one unbroken channel runs from start to goal over every gold light fragment, the pearl orb rolls along it and the level is done. Bolted tiles appear from level 41, 5×5 boards from level 61. There is no timer and no way to lose.

Tap a tile next to the gap, or drag itSlide a tile into the gapClick a tile next to the gap, or drag itSlide a tile into the gapArrow keysSlide the tile beside the gap that wayTab, then Enter / SpacePick a tile that can move, then slide itU / Ctrl+Z / Undo buttonUndo the last slideH / Hint buttonLight up the next slideR / Restart buttonRestart the levelL / grid buttonOpen the level list