The idea
Swap two neighbouring gems to line up three or more of the same color. Drag a gem onto its neighbour, or tap one and then the other.
Cleared gems make room for new ones falling from above. When those land in matches too, the chain continues on its own. That is the whole game: make a move, then watch.
The board is glued to your phone: turn the phone, or press Turn, and gems fall from whichever edge is up.
Special gems
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BombFour in a row. Clears a 3×3 area when it goes off.
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LineFive in a row. Fires a beam each way along its line, to the edge of the board.
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CornerAn L of five. Sits where the legs meet and fires a beam along each of them.
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TeeA T of five. Three beams: both ways along the bar and down the stem.
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CrossA plus of five, which only a cascade can make. Fires all four ways at once.
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PropellerA 2×2 block of one color. When it goes off it lifts away, lands somewhere else on the board, and pops a 2×2 there.
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RainbowSix or more connected, even two matches that touch. Swap it with any gem to clear every gem of that color.
Combining specials
Swap two special gems together for something bigger. Two beam gems fire every arm either of them had, so a horizontal and a vertical line make a cross. A bomb with a beam gem fires each beam three wide. A rainbow with a beam gem gives every gem of that color the same beams, and they all fire. Two bombs make a wider blast, and a rainbow with a bomb sets off every gem of that color. A propeller carries a bomb or a beam gem to wherever it lands; two propellers both fly; a rainbow with a propeller sends every gem of that color flying.
Scoring
Every gem is worth ten points. Longer matches, special gems, and each step of a cascade add more. There is no timer and no way to lose: if the board runs out of moves, it quietly reshuffles itself. A cascade runs for as long as the board keeps matching. To start over, hold New Game for a second.