Click bubbles to pop them.Match colors (you can 'play' a red bubble on top of another red, regardless of number) or number (you can play a 'red 5' on top of of 'blue 5'.There are a few special bubbles as well:- Draw Two: Next opponent in sequence must take two more bubbles.- Skip (circle with line through it): May not play bubbles for a few seconds- Reverse: Reverse the 'turn' order- Lock: Locks opponent from playing cards of that color (eg: a red lock means your opponent can't play red cards)- Wild (circle with all colors): Can play at any time, and any card can play on top of it.