The game has a 5v5 team versus team mode

Apart from the lighting, the props in ZERO HOUR are shared by the whole team
The camera cannot mark the location of enemies, and opening doors requires two steps, the first one being half-open and the second one being fully open. These details make ZERO HOUR more realistic than R6, but perhaps less so in terms of gameplay. In the current gaming world, the realism of the game seems to be the most important element for gamers.