It's simple. Click a character from the box. Make sure you have enough money for them. Each character has a special ability. Cat: Eradicates balloons every-so-often. Snatcher: Kills balloons that trample it. Money man: Produces 10 coins every so often. Ball: If touched, the ball will roll to the edge of the screen, killing balloons in it's path. Swallower: Swallows balloons in a specific radius, but won't give out any coins and it will disappear after a bit of time. Glowstick: Basically Scratch Cat Better. Golden Ingot: The best money accumulator in the game. He will produce more money overtime.
This is an old project I made last summer. I forgot the music credits, but I will just credit Popcap games for the music. The number sprite? @orangeorbound. SFX: @Magma331