

And, get a glimpse into the making of Portal: Still Alive with commentary from the developers. The game includes fourteen brand new bonus puzzles to challenge even the most skilled test subjects.

Experience the first first-person puzzle-action-adventure game with hours of single player gaming. Break the laws of physics using "portal" technology to solve puzzles and survive in this darkly comic story weaving adventure with brain-bending puzzles. Designed to change the way you approach, manipulate, and surmise the possibilities in any given environment, Portal has earned over 70 industry honors for its innovative gameplay, with more than 30 "Game of the Year" awards. Designed to change the way you approach, manipulate, and surmise the possibilities in any given environment, Portal has earned over 70 industry honors for Portal: Still Alive features the full award-winning Portal single player game from Valve, plus a new challenge mode. Summary: Portal: Still Alive features the full award-winning Portal single player game from Valve, plus a new challenge mode.You might visit a map point once and see no enemies around, while a furious swarm might be waiting at the same spot the next time. It tailors the zombie attack brutality and frequency according to your performance, making the gameplay fast-paced but manageable. Valve employs a unique AI-powered technology dubbed the ‘Director’ to generate a novel experience each time you launch the game. There are four campaigns and several DLC available. The final chapter always has you defending a position against the zombie onslaught before help arrives. If you go for one of the original campaigns, the game will put you through five levels connected with safehouses where you can heal, revive, and re-arm. Versus lets you play as either the survivors or the infected.Survival challenges you to stay alive for as long as possible.Campaign is the co-op mode with four people.


