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Half-Life 2 Hints
Grenade Tip
1 of 4: The door you entered the rotunda through is going to close later on, blocking access to the infinite grenade crate.
2 of 4: So go refill at the infinite grenade crate right now if you need to.
3 of 4: Also, don't break open the two supply crates in the room with the infinite grenade crate. They only contain more grenades, anyway.
4 of 4: Instead, carry both supply crates into the rotunda and leave them there for later. (Or do this with individual grenades if you've already broken the crates open.)