Kingdom Rush is a tower defense game set in a Medieval fantasy setting. There are empty lots set along the pre-determined path where the player can build towers. There are four towers to choose from: Mage, Archers, Barracks, and Artillery. At the beginning of each level, the player starts off with a certain amount of money in order to buy towers. As the monsters begin to emerge from one end of the path, the goal is to kill them using these towers before they reach the other end of the path. Killing monsters generates money, which can be used to upgrade towers as well.
This game can be installed on the Chrome browser or open source version Chromium, without an google account on webstore. Many operating systems are supported: The BSD family, GNU/Linux, Mac OS X, Android, iOS, and Windows.
For example, if you want to install Chromium on OpenBSD, write these commands:
$ export PKG_PATH=ftp://your.ftp.mirror/pub/OpenBSD/5.7/packages/architecture for your machine
$ sudo pkg_add -v chromium-40.0.2214.115p0