You play Kid, who likes to play with fire. Kid can move left (Z) and right (M), but careful – if Kid goes into the fire, game is over. When Kid is at the rightmost position, s/he can get a log by pressing the M key. Kid may drop the log (A) at any time… but if s/he drops it into the fire, the fire grows and you get points.

If not log is put into the fire, it eventually dies out, and game is over. Also, Kid can't grow the fire after a certain point. You need for the fire to quiet down a bit before feeding it again and marking new points.