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Half-Life 2 Hints
How can I open this door? It seems to be stuck!
1 of 4: Actually, the door isn't really stuck.
2 of 4: Simply pushing up against it won't open it, as it would in many similar games you may have played (like the original Half-Life).
3 of 4: Instead, you have to "use" the door with the "Use item" key (which defaults to E).
4 of 4: Remember that for other doors, since most of them work the same way.