You get 1 minute to make as many fuses as possible blow in this fuse box. Create rows by clicking on the first and last fuse in a series. All fuses in that row will then disappear, and everything falls down. Try to include three fuses of the same colour in your series, for a higher score. You can make horizontal, vertical and diagonal rows. You might see a fuse with for example 'X4' or 'X2': these are multipliers, that increase your score when they appear in a row.
You play this game with the mouse.