Attack of the Toy Tanks

Each level has between one and four enemy tanks. Destroying all of them in a level advances you to the next. Some tanks are more aggressive than others so be sure to utilize cover whenever possible. There are also obstacles that can destroy you (such as lasers and spikes) so be careful while moving around.

There are 60 levels in the game and are unlocked from the start, so while you do not have to complete 30 levels in sequence, it is recommended as the later levels can be more difficult than the earlier ones. If you find that you are having issues with a particular level, just press and quit to the main menu and select another one.

Thanks to Achievement Land for the 100% walkthrough video: