Eternal Red - prevent the waves of shadow creeps from getting from one portal to the other. Build sentry guns, set floor traps, and arm yourself strategically to survive 70 waves of enemies. Clicking on the various floor panels and sentry mounts will bring up menus to build and upgrade your equipment. You can also click on your own character and arm him with various weapons to help defend against the oncoming enemies. Be prepared. Every 10 waves a boss will appear.