make a large red rectangular sprite, and have the y position change as the timer increases.
Paulmedwal
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Depends how large you want the game to be.
Paulmedwal's suggestion works if you are aiming for single screen, but if you want a longer game you can simulate lava rising by having everything else falling - scrolling vertically. See "Gobo and the Flood" for a demo and some stealable scripts.
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