reason why WAW is near the bottom:because it uses real world WW2 footage.[which is already brutal and graphic on its own, but its for historical reasons]
reason why Halo CE is on the iceberg : Look up the levels with the flood in them. there is intense and disturbing.
Reason why Half life 2 is there: Watch this video of the Zombie sounds[which are backwards]. its why I think it belongs on the iceberg: https://youtu.be/LXuR41eisnM?si=xtbhn8C4IC-h9LSO
but also because theres a creepy radio song that plays near the end of the game, its mainly a easter egg:
https://youtu.be/46bF5oFF1YI?si=H4Y9CE-iIGztIwer