Bio Defence

Build your defense against swarms of viruses and bacteria. In Bio Defence, a microscopic world becomes a tower defense battlefield: clear groups with splash attacks, freeze enemies in place and time your meteor strikes before a boss reaches the base.

Unlock and upgrade 18 tower types as you progress. Choose one of 8 combat skills for your run and fight alongside Immuno, your guardian. Try different tower combinations, face 10 different bosses and earn achievements as your defense grows stronger. Available in 10 languages, including English.

Free to download. Contains ads and optional in-app purchases, including a monthly VIP subscription. A player profile with a nickname is required to start. An internet connection is needed to create your profile and use online features.