Push Gameplay

Push gameplay is one of the many types of mapping techs out there at the moment. The idea truly is to create an area that forces the player to move forward within the map and causes the area usually not able to be back tracked, preventing the player from reaching previous areas of the map.

One of the main ideas is to create an event that "pushes" the player forward. Mainly how you create that event is up to you but here are a few ways that mods and even Valve have implemented into their work.

Height Push

One of the most common ones really in nature. The hight push forces the player to move or jump off of a certain hight, and land a few feet below their original height. One of the main reasons this is used is due mainly to it being one of the most easiest things to pull off in mapping. Once the player drops off the ledge then the player cannot go back due to the ledge now being just a little to high to reach. One map in Half Life 2 Episode 1 utilizes this method. The player exits an old hospital and then must drop off a ledge about waste hight high then falls to the ground. However the player cannot return to that area due now to the ledge being just a tad too high.