MrDeckard said:
CoD 4 Veteran is pretty hard, but even it takes second to Halo: Reach on SLASO.
For anyone who doesn't know, this is Solo Legendary All Skulls On.
These skulls include, but are not limited to, the following: Health doesn't recharge without a melee. No HUD. Dying makes you restart the level. Shit like that.
If we're on the topic of SLASO, sure, Reach is tough, but nothing in the series compares to Halo 2 SLASO. It's extremely difficult but seems like it's probably theoretically doable; some levels haven't been done before, and some have only bee done segmented, like Gravemind [http://www.youtube.com/watch?v=tCHqiiRYj0M].
Its skulls can be more problematic. Sure, you get to have active camo instead of a flashlight even as the Chief thanks to the Envy skull. But the Covenant are ridiculously strong. Basically, for the particularly crazy stuff:
-Assassins ensures that most enemies are perma-cammo'd.
-The Armory skull makes it nigh-impossible to avoid detection by the enemy, and it makes the Covenant never sleep.
-Thunderstorm's rank-up causes all flood combat forms to have shields in addition to all the regular rank-ups.
-Angry causes the Covenant to shoot even more aggressively than normal.
-Ghost makes it impossible to cause enemies to flinch.
And that's on top of Halo 2's already ridiculous legendary.