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Gunforce II (Geo Storm in Japan) is a run and gun video game developed and published by Irem Corporation in 1994 for arcades. It was Irem's last arcade game.

This game was created by the same staff which would later form Nazca and is considered the spiritual predecessor to the Metal Slug series.


Some of the bosses from Gunforce II

Gunforce II plays much like other run and guns, where you control your character and must move through the stage while shooting down enemies. The character uses two guns at the same time, which fire at different angles each. You can pick up special weapons with limited ammo, which will replace one of the guns. Scattered along the stages are many vehicles, eleven in total, which the player can ride and use against the enemy forces. However, most of them don't provide protection for the player. Along the way the player will also find female hostages which can be rescued, though they only serve to add to the player's score at the end of a stage.


  • Some of the music in this game are remixed tracks from Air Duel, another Irem game;
  • Many of the sound effects used in Gunforce II were reused in Metal Slug, such as weapon samples and enemy voices;
  • Gunforce II and Metal Slug feature a very similar graphical design, right down to small details such as explosions and shrapnel;
  • It is possible that Metal Slug was originally intended to be a sequel to Gunforce II, given the similarities between the two games.

Flyers and covers

Metal Slug Series
Main Series Metal Slug: Super Vehicle-001Metal Slug 2/(X) • Metal Slug 3Metal Slug 4Metal Slug 5Metal Slug 6Metal Slug 7/(XX)
Spin-Offs Metal Slug: 1st MissionMetal Slug: 2nd MissionMetal Slug AdvanceMetal Slug 3DMetal Slug Tactics
Tower Defense Metal Slug DefenseMetal Slug Attack
Mobile Metal Slug MobileMetal Slug Mobile ImpactMetal Slug: Allen's Battle Chronicles (Mobile 3) • Metal Slug Mobile 4 (UMS: Landing) • Metal Slug Soldiers (UMS: Conspiracy) • Metal Slug Fighters (UMS: Fierce Battle) • Metal Slug Warriors (UMS: Triumph) • Metal Slug STGMetal Slug Mars Panic!Metal Slug TacticsMetal Slug M1Metal Slug M2Metal Slug 2013Metal Slug Team MissionMetal Slug: AwakeningMetal Slug: Commander
Pachinkos Metal Slug Type-AMetal Slug SV-001Metal Slug 3
Compilations Metal Slug 4&5Metal Slug AnthologyMetal Slug Complete PCArcade ArchivesNeo Geo Pocket Color Selection
Cancelled / Discontinued Metal Slug GBA PortMetal Slug Zero OnlineMetal Slug TouchMetal Slug RevolutionMetal Slug WarsMetal Slug XX OnlineMetal Slug Infinity
Prototypes Metal Slug Advance
Related Titles
Cameos / Crossovers The King of Fighters '99SNK vs. Capcom: The Match of the MillenniumThe King of Fighters 2000SNK Vs. Capcom: CHAOSNeo-Geo Battle ColiseumThe King of Fighters: Maximum Impact 2SNK Vs. Capcom: Card Fighters ClashSNK Vs. Capcom: Card Fighters DSDays of Memories 2Neo Geo Heroes: Ultimate Shooting!Battle CatsRPG! Sister QuestJetpack JoyrideThe King of Fighters XV
Ikari Warriors Ikari WarriorsVictory RoadIkari III: The RescueIkari: Leona Gekitohen
Irem Games
Irem's D.A.S. Universe Air DuelUndercover CopsIn The HuntGunforce II
Books Metal Slug: The Ultimate HistoryMetal Slug Attack Official Artbook