Metalocalypse: Dethgame

Sylvester and Tweety was one of several games based on Warner Brother cartoons by Sunsoft. It eventually met its end when Sunsoft went bankrupt in early 1995.

Gun Loco was an Xbox 360-exclusive shooter in development at Square Enix Europe which has been canceled.

AirMech Arena is a highly competitive fast-paced real-time strategy game, where players use versatile AirMechs to amass combat forces and destroy enemy fortresses. In the future, the last survivors of the Great War continue their fight alongside the ultimate war machine: the AirMech. Created using lost technology, pilots have found, salvaged, or stolen AirMechs to protect the weak or to pillage. Which side do you fight for? By Land and by Air: Transform between air assaults and ground attacks with the touch of a button. With nine AirMechs available, each with unique traits, there’s an ultimate war machine for every play style. Team Up or Go Solo: In AirMech Arena, gamers engage in ferocious real-time battles up to 3v3 in PVP or Co-Op Modes. Players can form teams and skirmish at any time, with the teams in battle matched by their skill level. Unlock a large arsenal of AirMechs, pilots, units, upgrades, special items, customizable skins and more!

A cancelled sequel to Conker's Bad Fur Day.

A canceled sequel to Acclaim's city building PlayStation/PC title of 1997. The game was shown at E3 '98 but never released.

Jazz Jackrabbit 3 (alternatively called Jazz Jackrabbit 3D or simply Jazz3D, subtitled Adventures of a Mean Green Hare) is the unreleased third installment in the Jazz Jackrabbit series. Spearheaded by Dean "Noogy" Dodrill (an animator for Jazz Jackrabbit 2) and coded by World Tree Games, it was developed for the original Unreal Engine technology in 1999. Like many other mascot characters of the late 90s, Jazz would venture into the realm of 3D for the first time. The game was originally slated to be released in 2000, but since Epic was unable to find a publisher the game was ultimately cancelled. Gathering of Developers, which published Jazz Jackrabbit 2, refused to publish this game due to reportedly low sales of Jazz 2. A playable Alpha Demo exists online.

A rather notorious canceled game that was planned for release on the Gizmondo.

Idiot Squad is a puzzle game published by Hydravision Entertainment released on Apr 19th, 2012 for the Sony PlayStation Portable.

This is a very early mode-7 racer based on the Hanna-Barbera cartoon that aired in the late 1960s. The game has a large variety of stages, but there is no collision detection, and the opponent racers are not programmed to stay on the track. It looks like it would have been designed to be a Mario Kart clone, complete with weapons and stage hazards, but none of that has been included in this prototype. There is a near final prototype of the Genesis version of the game, which shares many of the same graphics, notably with the background and cars. The layout of the stages is quite a bit more like Mario Kart in the SNES prototype. Of course, it is entirely possible that the final SNES version would have had the same design as the Genesis version if it was completed.

Before being officially released in 2011, Duke Nukem Forever had demos and promotional images and videos released to the public, which had gameplay different from what ended up being released, since the game went through a 14 years long development hell and technology changed during this period. The build from the 2001 E3 that was leaked online in May of 2022, and it's one of the most known pre-release versions of the game.