Change one letter in a game's title to make a new 'game'...

You can add or remove a letter or simply change any existing one to a new one.

A few off the top of my head to get you started.

Super Mario Sunshite
GoldenAye - t'names Bond, Jim Bond
Super MarioFart
The Chronicles of Ruddock - Starring Liverpool and West Ham legend Neil.
Project Gotham Raping

How old are you!? '__'

You're never too old for fart jokes and you're kidding yourself if you think you are.

:P

Wino Crisis - a sequel to Tapper

President Evil 4...3 - try to intercept memos from the 43rd President approving torture.

Pataporn - rhythm action game

Sandal Hearts

Colon Wars

Ratchet & Crank - Chev Chelios is transformed into a midget robot.

Halo Wart

Mass Defect

Assassin's Creep

One letter? :p

Anyway:

Super Mario Tart - spin-off starring Princess Peach, naturally.

Banjo-Pooie

Erm... yeah, I'm not very good at this.

The Secret of Donkey Island

Mild Arms

Mod World

Cuntra

Haha some of those are great.

Thread win :D

Guitar Heron
Keller 7
Night Night
Halol
Company of Zeroes
Fooking Mama

Oops I changed two letters for Ruddock.

INSTAFAIL

Cocking Mama

Cunterstrike
Sesame Street Crayon: Number Cunt
Operation Body Cunt

OK you get the picture....

Donkey Mong

WWE Smackdown: Shit Your Mouth

Wanked: Weapons of Fate
Wanked Dead or Alive
Need For Speed Most Wanked

Redneck Deer Cunting.
Cabela's Dangerous Cunts.
Tigger's Honey Cunt.
Predator: Soon the cunt will begin.

I'm here all day...

Alone in the Ark - Noah gets it spectacularly wrong and gets kicked out of the house by his long-suffering, zooaphobic, wife.

Conflict: Denied Pops - try to smuggle your own drink past the angry bouncers and into the club. Pikey.

Rattle Raper 2 - i cant add anytinhg to this.

Cattle Raper - you play a farmer that loves animals just a touch too much.

Ponce of Persia - Far eastern themed paedophile simulator

Fart Cry 2 - Extricate gaseous matter into the atmosphere while openly weeping

D.A.W.X - Game specifically made for the sort of nitpicking twonks who flag up technical failings in the film 'Top Gun'

Tokyo Bust Simulator - Japanese Bewbs!

Titris

Guitar Herd - Mass hypnotism of herd mentality gamers to buy the same game over and over and over again

Rock Bland - As above, but with shittier controllers.

Tiger Woods Gorf - pilot your lone black golfer in seemingly impossible odds against the elitist PGA empire in a bid for conquest.

Puce- ride a quad bike round a reddish-brown landscape

LOLZERS.

What was wrong with Puke?

Ninja Garden - the *really* extreme garden makeover
Supper, Mario Bros
.
.
.

I'm not very good at this.

Super Mario Bris

8 days after Mario is born, his dad approaches the cot with a cutthroat razor and...

Disgaya - homophobic game

Axegay - more homophobia

Poo Human

Castlevainia - Dracula needs a makeover!

World of Poo