Halo 3's methods for handling grenades and grenade limits will likely change due to the introduction of the Spike Grenade, and the reduction in the number of grenades of each type that can be held from 4 to 2. However, indications are that multiplayer game types will be even more customizable in Halo 3 than they were in Halo 2, so although there is no explicit mention of it, it is conceivable that there might be an option for unlimited grenades of one or more types in a multiplayer game.