What makes you play better? It can be music, a video or something else, and for what game. Any game really, I don't care.
I personally listen to a custom playlist I created on YouTube that has music I picked from smooth jazz with an urban beat, rock (not death metal), electronic, and a few of E-Dubbles Freestyle Fridays.
Mountain Dew.
The only drink with enough caffeine to affect me.
Mountain Dew and Doritos
/s
I generally play better if I'm calmer.
Or sometimes it's just a good day and i'm in "the zone" and I rek everyone regard'ess of what's happening
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I really dunno, I suck at Video games and I don't think anything can change that. However playing together as a team with people you can see and talk to always helps the mood...
If I focus on the game I perform better.
For me it's just silence. Whenever I play a video game, something like my dog barking or the dehumidifier in my basement turning on can kinda annoy me and throw my guard off.
Dr Pepper cherry, sometimes a bowl of cereal
Music.
Whatever kind is my preference at the time.
Obsessing over getting good and playing constantly until I can become decent.
Some examples: Batman: Arkham combat, speedrunning Sonic Unleashed daytime levels, driving in Need 4 Speed, Smash Bros. tech skill, etc.
Also, watching YouTube videos helps me a lot. Seeing the way professionals pull expert level play is really helpful for me, and I just go and try and replicate what I see.
Usually music helps me with stuff like smash bros, specifically the megaman theme remix.
For games like halo having a team of friends cause then we understand how we play and can set up like that, and keeping calm helps, you get salty and your skill drops.
A playlist of anime OPs.
I always play music on my iPad when I play Smash, helps me focus better.
Also Coca-Cola because it's 
Listening to Game Grumps.
Getting boosted.
Rage.
Cheat codes
GET GUD
GET LMAOBOX
THE BEST TF2 AIMBOT
