I just want to give you some advices. While you are doing the levels, try to find the level where you can get more money. The best level to gain money is level 30. You can win just using four zombie penguins and the additional zombie penguin. Upgrade the speed boost and the life boost completely. I don't think you need more than four bombs, but you can buy them if you can't finish the level. Use the additional penguin then the speed boost. Remember to use the life boost! Use the bombs especially against teleport turtles. Upgrading penguins: more expensive is the upgrade, the penguin becomes stronger (the robo penguin is the best). Just for fun: when you have five robo penguins and the additional robo penguin, try to do the first level! I hope this guide will help you.
