Oasis is a turn-based strategy video game developed by American studio and published for Microsoft Windows by PlayFirst in April 2005. Konami released a mobile phone port in 2006 and Electrified Games released an iPad version, renamed as Defense of the Oasis, in 2010. On August 25, 2020, the iPad version was published on Steam. Oasis is a casual game set in ancient Egypt that combines Civilization-style strategy and puzzle gameplay. Oasis "has been described as Civilization meets Minesweeper".