R-Type Leo[a] is a 1992 horizontal-scrolling shooter arcade game developed by Nanao and published by Irem.

[3] In Leo, players take control of the titular space fighter to travel the man-made mechanical planet Eden and destroy its supercomputer core Major.

The game was initially conceived as an original shoot 'em up by Nanao before being retooled into an R-Type project by Irem.

The plot involves a man-made mechanical planet named Eden, which after its supercomputer core called Major begins to malfunction, uses its defense systems and machines to destroy what is left of mankind.

The most notable change is the removal of the Force, a shield item from previous installments that also acted as an additional source of firepower.

[2][5] Atsushi Inaba, currently of PlatinumGames, was involved in the development of the project before joining Nazca Corporation with other ex-Irem members.

[10] Electronic Gaming Monthly praised the inclusion of cooperative multiplayer, visuals, sound design, gameplay and bosses.