If the game fails to open, use the Steam Support guide to verify the integrity of the game files.

The game uses the Portal 2 engine branch and has relatively low requirements. Minimum Requirement Windows 7 / Vista / XP (Steam now recommends Windows 10+) Processor 3.0 GHz P4, Dual Core 2.0 or higher Memory Graphics 128 MB VRAM, DirectX 9-compatible (NVIDIA GeForce 7600+) Storage 4.5 GB available space Troubleshooting Common Issues

You must already own Portal 2 on your Steam account to install and play this mod. Cost: The mod is completely free . Key Gameplay Features

Using a handheld tablet (the "Time Machine"), you can record all your movements—including walking, jumping, and interacting with objects.

The official and safest way to download this mod is through the Thinking with Time Machine Steam page .

Right-click the game in your Steam Library, select Properties > Local Files , and click Verify integrity of game cache . Thinking with Time Machine on Steam

The game features a new campaign set after the events of Portal 2, including custom models, textures, and nine highly challenging test chambers. System Requirements