I'm 20, been playing since I was 3-4 I think.
The 3 maps I come to think of (hard to remember them all, but I guess the best remembered are probably the best.

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-Tsavo Highway, Halo 3
It's always fun to feel like you're making progress, and this map almost made the game feel open world. You had to get to Voi and get, here's a warthog and gl! Was pretty much all you got. Beautiful and very intense map.
-The Mace, Call of Duty 3
- Last stands are always awesome and this is one of my favorites. You fight a desperate, retreat up a hill as a small force of polish soldiers try to hold off the Germans. Very exciting and since there are actual characters I liked it made it all the more tense.
Helms Deep, Battle for Middle earth
-It's Helms deep, I don't know what more to say. It's a last stand as well as a castle defense vs a huge army of Uruks in a fantasy setting, I'm so sold. ^w^
To be fair I tried to fill it out with different games, but could've easily put almost every Halo map in there. The Pillar of Autumn, Halo, The Truth and Reconciliation, The silent cartographer, Assault on the Control Room, 343 Guilty Spark, The Covenant, The Ark, Crows nest, Floodgate and Halo the 2th.
Actually I just wanna play Halo now.
