Thinking with Time Machine

Thinking with Time Machine is a 2014 modification for Portal 2 developed by Ruslan "Stridemann" Rybka and published by SignHead Studio. The player controls Chell, the protagonist of the Portal series, who wields the portal gun, while the gameplay revolves around the concept of a tablet-like time machine that is also controlled by the player. The tablet allows the player to record their movement and replay the recordings, creating a double that performs the recorded tasks. Additionally, the mod allows the player to see their own legs by looking down. The development began after the release of Portal 2. Initially released on the Mod DB website, Thinking with Time Machine went through the Steam Greenlight process, after which it was released as a free modification on Steam on April 18, 2014. The time machine concept and the ability for the player to see their own legs by looking down were commended by critics, while the lack of usage of the portal gun and the mod's short length were criticized.