How to motivate players to move: 1) Place key points in the corner of the playable map, as far from each other, as possible (most likely the points with major number of respawns 2) Categorize items - make luxury items, which will rapidly increase gameplay, less affordable, with fewer spawn points, and as a sort of a reward - in bunkers, hard to get in locations, protected by large number of enemies (maybe stronger enemies? mutated zombies? like fallout supermutants?) perhaps will need a large group of players to fight massive amount of zombies. 3) Make overally items a less affordable. To prevent, that some player will collect a lots of items and then just log out and never come back, could be solved that way, that player, who is logged out a longer time, will virtually "die." His death will automatically mark his grave by spawning a larger number of zombies, which will then "carry" his loot. Other players, which will kill this group, will get acces to these weapons. This can remove the motivation killer, called automatic spawn - the respawn of items could be less frequent. 4) and finaly - adding something as a GAME GOAL - which doesnt have to entirely mean, that once is achieved, it means finish of the game. There could be some sort of a military station - laboratory, huge underground complex, in the middle of the map - which only a small army of players can achieve to conquer. These groups should be limited - force players to fight over that place against each other. This place would be overcrowded with zombies, the goal would not mean necesarily to "p[ush a button to win a game" - just perhaps there could be variety of sections with ultimate loot - like a good sniper rifle, which right now, is just laying around on some guardtower. Or some unique military suits, another special weapons, tools which allows to repair vehicle. Some spot, to which you need to move around the map a little bit, collect gear, group together and assault. The zombies in there would just keep spawning.