Irem Corporation was a Japanese video game developer and publisher known for creating several classic arcade games during the 1980s and 1990s. They produced a variety of games across different genres, including shooters, platformers, and sports games. Some of the most notable Irem classics include:

1. Moon Patrol (1982): An iconic side-scrolling shooter and driving game where players control a moon buggy, navigating through lunar terrain while avoiding obstacles and shooting at enemies.

2. R-Type Series (1987-1991): A renowned side-scrolling shoot ’em up series known for its challenging gameplay, unique power-up system, and innovative level design. R-Type and its sequels gained popularity in arcades and on home consoles.

3. Vigilante (1988): A beat ’em up game where players take on the role of a vigilante seeking to rescue his kidnapped girlfriend by defeating waves of street thugs and gang members.

4. Battle Chopper (1987): Also known as Mr. Heli, this scrolling shooter features a helicopter battling enemy forces while collecting power-ups and upgrades.

5. Kung-Fu Master (1984): An influential martial arts-themed action game where players control a Kung-Fu expert named Thomas as he fights his way through a series of levels to rescue his girlfriend Sylvia.

6. Undercover Cops (1992): A side-scrolling beat ’em up set in a post-apocalyptic future, featuring three characters with unique abilities battling crime bosses and their henchmen.

7. R-Type Leo (1992): A spin-off from the R-Type series, R-Type Leo is another side-scrolling shooter with cooperative gameplay, allowing two players to control separate ships.

8. Image Fight (1988): A challenging vertical shooter where players pilot a spacecraft against a wide variety of enemy forces and bosses.

These Irem classics are beloved by arcade enthusiasts and retro gaming fans for their gameplay innovation, challenging difficulty, and nostalgic charm. While Irem is no longer active as a game developer, their legacy lives on through these iconic titles that have left a lasting impact on the gaming industry.