This will show you how to get additional icons that will be available in the ? tab beside the years when selecting your buddy icon. To enter these codes, you must reset all progress and enter the codes when typing in your screen name. Entering these screen names will unlock respective icons. (Your first name does not need to be the first name of the character)

Password	Effect
Bioshock	Bioshock icon
Borderlands	Borderlands icon
BradDarko23	Brad's icons
Chell	With cake!
Clippy	It looks like you're unlocking buddy icons
Crash	Crash Bandicoot icon
Deadworld	Elegy icon
Dota2	Dota icon
H3RST0RY	"Her Story" icons
Halflife	Half-Life icon
HerStory	Stanley Parable icon and easter egg
Isaac666	"The Binding of Isaac" icons
Jacksepticeye	The green eye icon
JobBot	Job Simulator icons
JohnCena	Icon and AND HIS NAME IS JOHN CENA achivement (Steam Only)
Kappa	In Kappa We Trust
Markimooper6	Markiplier's icon
Minecraft	Minecraft icon
Password123	Unlocks all buddy icons
Radiohead	Radiohead icon
TravisDaMan	Travis' icons
Zelda	It's dangerous to go with out this buddy icon
Zombies	The Walking Dead icon
arcadefire	Arcade Fire icon
daftpunk	Daft Punk icon
emerly35	Emily's Icons (Coldplay, Snow Patrol, Muse, etc.)
modestmouse	Modest Mouse icon
muchusername	Doge icon
nineinch	Nine Inch Nails icon
nyancat	Nyan Cat icon
sigurros	Sigur Ros icon
undertale	flowey the flower!
vaultboy	Makes your buddy icon look like the Vault 111 from Fallout 4!