Technical Group Laboratory, Inc. (株式会社テイジイエル) (usually abbreviated TGL) is a Japanese game developer and publisher. It was founded in July 1984 in Osaka. The company is famous for popular video game series such as Farland Story and Variable Geo. TGL has been also involved with the production of adult games under their brand GIGA. The Taiwanese WindThunder team they formerly owned, with whom they produced the Guardian's Sword series for Windows, is currently an independent developer since 2001.
- Guardian's Sword: Alpha Era
- Guardian's Sword EX
- Egria: Guardian Sword II
- Sengoku Bishōjo Emaki: Cut Sky
- Sengoku Bishōjo Emaki: Cut Sky ~Chapter Summer Wind~
- Dark Solid