If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
Tri is an awesome 3D puzzle game made with Unity3D. Place force fields to get over obstacles and reflect dangerous lasers. This game has been made in 48 hours. It can look like Portal. Have fun!
Use WASD or the arrows to move, the spacebar to jump, 1/2/3 to switch between generators, mouse left to place a generator, E to remove force field, mouse right to make a force field permanent.