Fraghouse Invasion is a large collection of new maps, weapons, monsters, skins, models and a variety of other content that has been built from one code twist of the original Invasion. It takes the normal Invasion gametype and gives it a few subtle tweaks that make immense gameplay changes. Monsters are spawned at specific locations rather than player starts, meaning the players can start in a fort structure as a defence from the oncoming hordes of monsters! Version 4 features many new maps, Kung Fu and Impact Hammer melee weapons, Map Monsters (configurable monsters for each map), FHIEXP (a small but fun EXP system), many bug fixes and new monsters and weapons, for example the Spikeball and the Flamethrower.
This is the full version of Fraghouse Invasion, which includes the v4.1 patch.