Click each Question Marked box to reveal either a friendly unit or an enemy one.
Friendly units consist of three levels of cannon, shooting 1, 2 or 3 rounds respectively, and a 'land mine' toilet roll that can one shot any enemy. Once you've revealed a friendly unit, you can place it on any free square where you think it will do the best job of defending Australia.
Enemy units consist of 5 levels of Corona Virus, each one containing more health than the last, although the weaker the Corona Virus, the faster it can travel towards Australia. Another enemy is the Kamikaze empty trolley, which explodes upon impact with any friendly unit, killing both it and your unit.
See how many rounds/enemies you can kill before the Corona Virus breaks through your defences and gets to Australia.