Duke Nukem Forever

Duke Nukem Forever is a 2011 first-person shooter video game for Microsoft Windows, Mac OS X, PlayStation 3 and Xbox 360 developed by 3D Realms and Triptych Games and finished by Gearbox Software and Piranha Games. It is a sequel to the 1996 game Duke Nukem 3D, as part of the long-running Duke Nukem video game series.
Intended to be groundbreaking, Duke Nukem Forever became a notable example of vaporware due to its severely protracted development schedule; the game was released in 2011 after fifteen years of development. The game was a financial success but received middling to negative critical reception.

About game:

The game takes place about twelve years after the events of Duke Nukem 3D. Duke is now a worldwide icon, and has achieved great fame from his heroic deeds. After sampling a video game based on his past heroics (the game Duke plays is a revamped version of the final level of the third episode of Duke Nukem 3D), he arrives on the set of a talk show for an interview. On his way to the show, Duke witnesses a news broadcast on a nearby television screen announcing that aliens have once again invaded. Unlike previous encounters, the aliens initially appear peaceful and at first seem to pose no harm to the humans of Earth. Duke's talk show appearance is cancelled to allow television stations to cover the alien invasion, and he retires to the "Duke Cave".
There, he receives a call from the President and General Graves of the Earth Defence Force (EDF). The president orders him not to harm the invaders, and adds that he is in diplomatic talks with the alien overlord. Duke obliges this request, but remains uneasy about the whole situation. However, before he can leave his chambers, he is attacked by hostile aliens. Duke is forced to disobey the president's orders and fight his way through the alien hordes in an effort to save Earth. Whilst fighting through his casino, Duke witnesses the aliens abducting women including his two live-in pop star girlfriends. Graves tells Duke that the women are being held in the Duke Dome, and that the aliens have a vendetta to settle with Duke. He also warns Duke that the aliens are using the Hoover Dam to power a wormhole so more aliens can come through. Nukem travels to the Duke Dome, using a wrecking ball to damage the building to gain access. Inside, he finds swarms of Octabrains and the missing women, who have been impregnated with alien spawn; Duke's girlfriends die after giving "birth" to alien babies. Duke finds the Alien Queen in control of the Dome and kills her, but is wounded in the process and blacks out.
After regaining consciousness, Duke fights Pigcops and aliens in through the Duke Burger. Soon he travels to the Hoover Dam in his monster truck; after battling through the dam, he finds his old friend Dylan, mortally wounded. He tells Duke that the Cycloid Emperor is at the dam, and that the only way to shut down the portal is to completely destroy the dam. Before dying, he gives Duke his demolition charges and wishes him luck. Duke places the explosives and destroys the dam, but the currents nearly drown him. Duke is revived after an EDF soldier performs CPR on him; he awakens to find the portal gone. The President, who was also at the dam, rages at Duke for ruining his plans to work with the Cycloid Emperor and that he has ordered a nuclear strike at the site of the dam to wipe out the remaining aliens, intending to leave Duke there to die. However, the Cycloid Emperor emerges and kills the President and his security detail. Duke kills the Cycloid Emperor and is rescued by Graves just as the nuclear bomb explodes.
The game ends with a satellite surveying the detonation area and listing Duke Nukem as killed in action, to which Duke replies off-screen, "What kind of shit ending is that? I ain't dead. I'm coming back for more!" A short scene after the ending credits depicts a press conference, where Duke announces his intent to run for the President of the United States.

Gameplay:
Duke Nukem Forever is an action-oriented first-person shooter. Players take control of Nukem as they navigate through a series of levels which take place on Earth and beyond. The game allows players to interact with various in-game objects, including urinals, water coolers and whiteboards which allow players to draw their own images. The gameplay is similar in some respects to the first-person shooter games of the late 1990s and early 2000s, with each level culminating in a boss battle in which Nukem has to fight and kill a large, significant alien.

Unlike in the previous games, Duke can only hold two weapons at any one time in a manner similar to the Halo series, although pipe bombs and laser tripwires are considered inventory items and as such are not limited by this restriction. However, the PC version has been updated to allow Duke to hold four weapons in the single-player campaign. Items that have an effect on Duke can be picked up by the player; these items are steroids, beer, and the holoduke. Steroids increase the strength of Duke's melee attacks by a great deal for a limited time. Beer makes Duke much more resistant to damage, but blurs the screen. A holoduke creates a hologram of Duke Nukem that looks and acts in a very similar way to Duke, but often says slightly twisted versions of his one-liners. Whilst the holoduke is in effect, Duke becomes invisible and the AI characters do not recognize his presence. The jetpack also returns, but only in multiplayer.
Instead of the health system featured in the previous Duke Nukem game, in which health would be depleted when Nukem was injured and would only increase upon finding a health pack, drinking water from fountains/broken fire hydrants, urinating or using the portable medkit special item, Duke Nukem Forever employs a system involving an "ego bar". The ego bar depletes when Duke is attacked; once it is fully depleted, Duke becomes susceptible to damage, dying and causing the game to reload the last checkpoint. If the player avoids further damage, then the ego bar is restored as is Duke's health. The player can increase the size of the ego bar (thus increasing the amount of damage Duke can take) by interacting with certain items throughout the game (for example, a mirror), and by defeating bosses. The game employs a save system that is solely based on checkpoints.