Project Blue2020

You've fallen down a hidden manhole into a world of creatures so terrifying they'd scare the rats away. You can panic and perish, or blast your way through an endless maze of tunnels, searching for the secret passages to your escape. And that's the easy part. Because the Masters of the Caverns lay waiting - prehistoric creatures so powerful, so gigantic, they literally fill your screen! So load your arsenal and get ready for Blaster Master.

“METAL SLUG 2”, the 2nd entry in SNK’s emblematic 2D run & gun action shooting game returns to the battlefield on the Steam gaming platform!

Metal Slug 6 returns to the Rebel-Martian alliance featured in Metal Slugs 2, X, and 3, but on a much broader scale. Rather than repeating the previous games' events of the Martians breaking the alliance and the Rebels assisting the player in turn, the player now teams up with the Rebels and Martians to combat an even greater threat. Metal Slug 6 introduces a new play mechanic dubbed the 'Weapon Stock System'. Two gun power-ups can now be carried at the same time. Players can switch between the two weapons, or simply put them both away in favor of the default weapon. When obtaining a new weapon power-up, it will automatically occupy the inactive slot, or, if both are holstered, replace the less recent weapon of the two. The score is now multiplied by powers of 2. The faster the speed at which enemies are killed, the higher the power, as a meter at the bottom of the screen shows. When it says "Max" enemies and destructible objects will drop coins for an extra high score.

Metal Slug X is upgraded version of Metal Slug 2 (Metal Slug 2: Super Vehicle-001/I), which was released in March 1999 for the Neo Geo MVS. It fixed slowdown problems from the original game, and increased the difficulty. Metal Slug X also introduced some new elements to the game system.

Ghosts 'n Goblins is a platform game where the player controls a knight, named Sir Arthur, who must defeat zombies, ogres, demons, cyclops, dragons and other monsters in order to rescue Princess Prin Prin, who has been kidnapped by Satan, king of Demon World. Along the way the player can pick up new weapons, bonuses and extra suits of armor that can help in this task. The game is often considered very difficult by arcade standards and is commonly regarded as one of the most difficult games ever released. The game is considered by Gametrailers.com to be the world's second most difficult game ever made. The player can only be hit twice before losing a life (the first hit takes away Arthur's armor, and the player must continue on in his underwear until completing the level, or finding replacement armor). If the player loses a life, he is returned to the start of the level, or the halfway point if he has managed to get that far. Furthermore, each life can only last a certain length of time (generally around three minutes), the clock being reset at the start of a level. If the clock does run out, the player instantly loses that life. After defeating the final boss, but only with the cross weapon (if the player does not have the cross weapon, they will be prompted that it is needed to defeat the boss and restart at the beginning of level 5 and must repeat round 5 and 6 again regardless if the weapon is obtained immediately or not) for the first time the player is informed that the battle was "a trap devised by Satan". The player must then replay the entire game on a higher difficulty level to reach the genuine final battle.

The player takes on the role of Golgo 13 (also known as Duke Togo), an assassin whose objective is to destroy the leader of the Drek group. On the way, Golgo 13 must pass through several areas, including East Berlin, Athens, and Alexander Island, which is located off the coast of Antarctica. It is necessary to navigate several mazes in order to win, but one maze is a fake base with no way out. The mazes account for a large amount of the frustration players encounter with this game. The instruction manual contains maps for the mazes.

Action 52 is an unlicensed multicart video game compilation developed by Active Enterprises for the Nintendo Entertainment System. The NES version was released in 1992. The multicart consists of 52 games in a variety of genres, mostly scrolling shooters and platformers. The "featured" game is The Cheetahmen, which was part of Active's failed attempt to create a franchise similar to the Teenage Mutant Ninja Turtles. The NES version of Action 52 sold poorly and became infamous among gamers for the poor quality and functionality of its games; it is often considered to be one of the worst video games of all time.

Nichibutsu Arcade Classics is a compilation for the Super Famicom and Sony PlayStation released in 1995. It features three of Nichibutsu's (or Nihon Bussan) Arcade games from the early 80s, adapted for consoles but otherwise left as-is. Contract developers Syscom were brought in to make the adaptations. It was followed up by Nichibutsu Arcade Classics 2, which contained the original 1979 Arcade version of Heiankyo Alien and a graphically enhanced remake. The games included are Crazy Climber (An action game where the protagonist scales a building. Best known for its complex controls that independently control each hand), Frisky Tom (An action game where the protagonist has to maintain a plumbing system and protect it from rogue rats), and Moon Cresta (A single-screen shoot 'em up similar to Galaxian in which the player's ship can dock with larger ships between stages to become more powerful).