HOW TO PLAY Raiders drift in from the right on three lanes. Any raider that reaches the left edge gets through and costs points. Tap a lane to plant a stake. The gate asks you to combine like terms; the x coefficient opens it. Answer right and the stake goes up. A staked lane stops every raider that reaches it and pays for each one. Three lanes, three stakes. Plant early, hold the line. The pace climbs the longer you last, and the clock waits while you think.
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Safe to walk away any time: closing or freezing this game never costs you anything. Nothing here grades you or reports on you.