I forgot the "best" part of the thread:
The Batman and Robin team up in Arkham Knight
The Catwoman chases in The Adventures of Batman and Robin (SNES) and Batman Arkham Origins Blackgate
The major stealth sequence followed by the cinematic chase sequence in Beyond Good and Evil
The Seven Force boss fight in Gunstar Heroes
The police station level in Hotline Miami
Conker's Bad Fur Day has a lot. Many people remember the singing poo part in particular. I like the part where you grab villagers and feed them to the vampire bat.
Everything from the beginning of Castlevania Symphony of the Night to when Death takes your equipment away
Everything in Mega Man X 4 from the stages to the bosses. I really like the level with the air ships. Particularly if you use zero, the game plays more elegantly with him. Also, the three stage boss fight with Sigma and the anime flashback that precedes it if you're playing as Zero is chef's kiss...unless you're playing the English version with the crappy dubbing.
The Mega Man series evolved in cool ways over time. The slide (upgraded to dashing in the MM X series) , the charged up shots, the wall jumping in the MM X series, and lastly the awesome melee combat of Zero in Mega Man X 4
Every single stage in Mark of the Ninja. The game is perfect.
The Independence Day level of Starfox 64 and the stage where Star Fox's team breaks through an entire enemy fleet while they are freaking the fuck out the whole time. "Who ARE these guys?!". It's the most epic level in the entire game.
The Dreadnaught battles in Starlink Battle for Atlas
Take your pick from any of the bosses in Shadow of the Colossus
All of the stealth based parts of Journey
Ravenholm in Half Life 2
The entire Final Act of Mass Effect 2
The epic car escape in Brutal Legend as "Through the Fire and the Flames" is playing
Itagaki's original version of Ninja Gaiden II was a flawed game in many ways, but I loved how you could backtrack through a level that you've played through, and it would be littered with the blood, limbs, and corpses of everything you've killed.
Literally every single level in Sonic and Knuckles. They are so well designed and quite imaginative. Going super sonic and flying through space after Robotnick if you have all of the chaos emeralds is super epic too. Honestly, every boss fight in the game is fantastic too. The game is perfect. Getting to combine it with Sonic 3 with the lock on cart is great too, but the game already rules on its own and is the stronger half of the Sonic 3 and Knuckles adventure.
The fight against Mad Hatter in The Adventures of Batman and Robin for the Genesis. A psychedelic battle with a killer soundtrack
The Technodrome level in Turtles in Time on the SNES with the cool boss fight against Shredder where you fling the enemies at him. That throwing enemy mechanic along with the ground slam are such fun combat mechanics
The boss fights against Bebop and Rocksteady in the SNES version of Turtles in Time and the one in Rescue Palooza. It's fun watching them hit each other by accident. In the Turtles in Time boss fight they eventually just get pissed and start attacking each other until they take each other out.
The fight against Ganon in Ocarina of Time with the now famous back and forth ping, pong, thing with you knocking back his attacks. The entire final act of the game is epic.
The sphere mini-game introduced in Sonic 3 was the best chaos emerald mini-game ever made
The theme park level of Streets of Rage 2 that has you going through a bunch of neat areas like a pirate ship themed area, an alien themed area, and an arcade
The Farm level and the arcade themed levels of Lollipop Chainsaw. Easily the best levels in the whole game.
The opening bits of Evil Dead Regeneration with you revisiting Evil Dead 2's cabin are awesome. If that doesn't get you excited to play the rest of the game, nothing will
The music themed car chase levels of Valiant Hearts the Great War
Halo: Combat Evolved has some of the best video game levels ever, made even more awesome by the presence of the marines, and the hilarious AI and personality of The Covenant.
The "Rig" from Wild 9 and all of the sadistic things you can do with it
The trap system from the Tecmo Deception series
The hilariously sadistic puppy mini games in Earthworm Jim 2
The PDA mini-games in Alien Hominid, which were better than the main game.
The battle arenas in every Ratchet and Clank game. There are literally the best parts of the game.
All of the cat and mouse chases between Sly and Carmelita in the Sly Cooper series. Particularly this one:
All of The Red Star's boss fights
The tate system in Shinobi made every boss fight more interesting. Has any other game tried to copy this?
Sending people flying through destructible environments in Otogi like Dragonball Z
The shadow double power up in the NES version of Ninja Gaiden II
The environmental combat in Sleeping Dogs. Why don't more games let you use the environment against enemies in melee combat?
The Japanese, 2 player version of The Simpsons arcade is much better designed overall and more fun to play. The hammer weapon is stronger, there's more food, and you can fill your health bar beyond its maximum. I think there's one or two other changes too that I've forgotten.
Fire Emblem Warriors is one of the best Dynasty Warriors style games out there, because you have multiple characters on the battlefield that are
actually helpful (unlike most games of this type like Hyrule Warriors for example). You can swap control between them, order them to specific locations, and even assign actions to them like healing someone. If left to their own devices, they can usually kick ass unless you send them into a situation where they will be at a clear disadvantage. One of the few Warriors games where it doesn't feel like you're just one person fighting the entire battle by yourself.
Prince of Persia 2008 was a brilliant game that emphasized teamwork between two characters in so many fun ways. I also loved that you could effectively "ring out" some bosses by knocking them off a platform to instantly win the fight.
Winning fights in Battle Arena Toshinden 2 by knocking your opponent out of the ring or successfully executing a desperation attack if you were low on health was super satisfying.
Resident Evil 4. The cabin fight, the early battle with the village of enemies and your first encounter with chainsaw man, the fight with the lake monster, the giant cave troll encounters. I mean what the hell WASN'T awesome in RE 4? It was just great moment after great moment.
The talking flowers and giant wonder seed moments in Super Mario Bros. Wonder were brilliant
The time travel/shifting between 8-bit and 16-bit graphics in The Messenger is brilliant. Also, the Shopkeeper's role in the game and his stories are a HUGE part of the game's charm. Especially if you initiate his cabinet rants.
Guacamelee seamlessly blending environmental traversal moves with combat. Every new move you got was a new way to fight enemies, and a new way to navigate the environment as well.
Eating an entire planet in Tales from Space Mutant Blobs Attack
The Sanitorium battle with the Wendigos in Until Dawn
Air pirate boss fights in Skies of Arcadia
Sinking pirate ships in Sly Cooper 3
Word insult fights in the first Monkey Island game
Spray painting stuff in the Jet Grind Radio games was fun
Infamous Second Son had a super attack you could do that was so ridiculously fucking powerful. I loved entering into a big fight, pulling one off and destroying EVERYTHING and EVERYONE around me.
The Darkness had a weird tentacle power you could use where you could use it to enter an area and kill enemies without you actually being there. I remember clearing out a whole building full of enemies with it without even stepping inside.
Creeping Darkness is the first power you gain in The Darkness. It allows you to detach a tentacle from your body and send it out to scout or kill opponents without approaching them physically. You lose control of Jackie while using this power, but can guide the tentacle through spaces that you...
thedarkness.fandom.com
All of the hilarious (and violent) things you can do by slowing down time in Just in Time Incorporated
Picking up an enemy and using them to beat the fuck out of another enemy in the River City games
Knocking enemies into pits or off high ledges in video games. There is something so sadistically fun about this. Watching an enemy fall to their death fills me with glee.
Taking pictures of stuff in games is strangely fun. I'm not talking about gay ass "photo modes" in games, but stuff like taking pictures of animals in Beyond Good and Evil or trying to take perfect shots in Dead Rising.
Celestial brush powers in Okami