From the in game instructions: Find a group of 3 or more blobs of the same colour and draw a line connecting them by clicking and dragging with the mouse. ... Now let go (or click again) to make the selected blobs explode and those above drop down! Lines of 6 or more blobs are rewarded with a bomb - click on it for maximum carnage! The multi-coloured wildcard blobs will match with blobs of any colour, so use them wisely! The game will end when there are no more groups or bombs on the board, so plan each move with care!