Swipe a rune into its neighbour to make a line of three or more. They break, the ones above fall, and anything that lines up on the way down breaks too. That's a cascade, and it's where the points are — the multiplier climbs for as long as the chain keeps going, then resets when the board settles. You have 64 seconds. Gold buys more time and relics that change the rules. Bank the run before the clock does. Everyone gets the same board each day.

Fly with the stick (or WASD/arrows) - your cannon fires by itself. Grab orange capsules: each one moves the selector at the bottom. Press ACTIVATE (or K) to cash the chain in for that hardware. Repeated buys raise the tier. Bosses end each level. Don't touch anything that glows red.

Hold the LEFT or RIGHT side of the screen to steer your sinking probe. Sonar pings reveal the walls for a moment - remember them. Jellyfish glow on their own and give bonus score plus a free light burst. Mines barely glow at all. Survive as deep as you can.

WASD or arrow keys to fly. Hold Space to fire. B or Enter drops a bomb. F releases flares and is the sure answer to a missile lock. Shift or E triggers overdrive. P or Escape pauses, and Q stands down. On touch, drag to fly and use the on-screen buttons. Skim close to enemy fire to charge overdrive. Destroy ground targets for upgrades. Only finishing all five stages posts a score to the leaderboard.