Infectonator 2

Infectonator 2 is a classic pixel strategy Flash browser game developed by Toge Productions and published by Armor Games, released in 2012 as the sequel to Infectonator: World Dominator. Players take the role of a mad scientist, deploying zombie virus in cities around the globe to trigger chain infections and turn civilians into zombies. Each city has infection objectives. Earn coins after completing missions to upgrade virus infection chance, zombie HP and movement speed, and unlock items like bombs, landmines plus many special mutated zombies. Police and military forces will resist the outbreak, so players need to carefully plan the virus drop position. It keeps the series signature dark humor and pixel art style, controlled by mouse clicks with hotkeys. It was one of the most popular zombie strategy Flash browser games at that time.

These games get the keyboard directly — the controls are whatever the game itself defines, usually in its own help or options screen. Some games show on-screen buttons on phones.