@MrWilson I was telling a friend about this site, they said they would probably come as they dont really enjoy airsoft too much anymore, anyway, they came up with a game idea for you, not sure if it's already been suggested
Terrorists vs police (names are obviously changeable)
The terrorists have a hostage on the top floor which cannot be killed as it's too easy. The terrorists then set themselves up on each floor, you could have as many or as little as you want on each floor, the police in this instance then go through, floor by floor clearing them out, once the terrorists are shot out, they are dead (one life). This is done all the way to the top, where the hostage is then taken by the police and they then have to go down all the floors and get the hostage to where they spawn on floor 1.
Once terrorists of room 1 are taken out, they can reset at any position in floor 1 once the police are in floor 3 to avoid any confusion from respawning police. (Respawns for police are on a changing basis, I.e if the police are on floor 4, respawn is floor 3, if they are on floor 3, respawn is floor 2, this means they never find out where the next set are deploying as the terrorists respawn after the police are 2 floors above them, hopefully explained this well enough) the terrorists cannot move up and down on floors once they have been shot out. This means not everyone will deploy over the top floor in first phase, meaning it's a bit more intense per floor. Perhaps depending on numbers you could say minimum of X per floor.
The police have infinite respawn in the 1st phase, but only one once the hostage is taken by them, in this phase, the terrorists of that floor, have infinite until that floor is taken in phase 2. The hostage cannot be killed but cant walk alone or fire a gun. The person "holding" the hostage or guiding through the floors can only use a pistol or shotgun.
Winner is determined by how fast they complete the two phases (if they can). So there is a swap after so the terrorists become police and vice versa.