Thinking with Time Machine is a unique modification for Portal 2 that introduces an engaging time manipulation feature. Players utilize a Time Machine to create a duplicate of their past self, which becomes essential for solving various puzzles throughout the game. The gameplay is built on the foundation of the original Portal mechanics but adds a fresh twist by allowing players to strategize with their past actions.

As players navigate through the game, the twin created by the Time Machine mimics all movements and actions of the player, providing a new layer of complexity to puzzle-solving. This innovative approach not only enhances the gameplay experience but also encourages players to think critically about their actions and timing. Overall, Thinking with Time Machine offers a compelling blend of action and strategy in a familiar yet rejuvenated puzzle environment.