Listing all games similar to Fortress Underground

H.E.R.O. »
[2600] H.E.R.O. (1984) (Activision, John Van Ryzin) (AZ-036-04)[5200] H.E.R.O. (1984) (Activision)[Atari 800] H.E.R.O. (1984)(Activision)
Scramble »
[MAME] Scramble (bootleg)[MAME] Scramble (Galaxian hardware)[MAME] Scramble [MAME] Scramble (Stern)[DOS] Scramble (1990)(Softdisk Publishing)[MAME] Scramble (Karateko, French bootleg)[MAME] Scramble (Stern Electronics)[MAME] Scramble (bootleg?)[MAME] Scramble (Pinball)[MAME] Scramble (Stern Electronics set 2)[MAME] Scramble (Reben S.A. Spanish bootleg)[MAME] Scramble (Petaco S.A., Spanish bootleg)
Menace »
[Amiga] Menace [C64 PP] Menace (UE)[Atari ST] Menace (1988)(Psyclapse)[cr Delight][one disk][Atari ST] Menace (1988)(Psyclapse)(Disk 1 of 2)[a][Atari ST] Menace (1988)(Psyclapse)(Disk 1 of 2)[!][Atari ST] Menace (1988)(Psyclapse)(Disk 2 of 2)[a][Atari ST] Menace (1988)(Psyclapse)(Disk 2 of 2)[!]
Blood Money »
[Amiga] Blood Money [C64 Tapes] Blood Money (E)[DOS] Blood Money (1989)(Psygnosis)[Atari ST] Blood Money (1989)(Psygnosis)[b][Atari ST] Blood Money (1989)(Psygnosis)[cr Confederacy][b][Atari ST] Blood Money (1989)(Psygnosis)[cr Delight][a][Atari ST] Blood Money (1989)(Psygnosis)[cr Delight][m Superior][t][Atari ST] Blood Money (1989)(Psygnosis)[cr Delight][Atari ST] Blood Money (1989)(Psygnosis)[cr Replicants][t][a][Atari ST] Blood Money (1989)(Psygnosis)[cr Replicants][t]