Faselei! is a tactical role-playing game developed by Sacnoth for the Neo Geo Pocket Color. It was published by SNK in 1999 in Japan and 2000 in the United Kingdom. A prospective North American release was cancelled when the console was pulled from sale. Following the exploits of the titular mech-piloting mercenary group during a civil war, the gameplay focuses on combat using mechs, with actions determined by commands imputed using a pool of action points.

Sacnoth Inc., renamed Nautilus Inc. in 2002, was a Japanese video game developer based in Tokyo. The company was founded in April 1997 by Hiroki Kikuta with funding from SNK; its staff, including Kikuta, were veterans of Square. While their first releases were the Dive Alert games for the Neo Geo Pocket Color (NGPC), the company was founded to produce Koudelka, a role-playing video game for the PlayStation. The development of Koudelka was troubled due to creative differences between Kikuta and the rest of the staff, with Kikuta resigning as CEO following the game's release and being replaced by Jun Mihara. The company also released the NGPC game Faselei!.