Title: Threshold
Environment: MSX or newer, Keyboard & Joysticks, Musical Memory Mapper Cartridge
Genre: Shoot 'em up
Language: English
Year: 1983
Publisher: SierraVision
Developer: Sierra On-Line Inc.

Notes:
- Start the game with ROM2MMM.COM under MSX-DOS 1/2, or from a plain ROM of
  same size.
- Conversion by GDX.
- The MSX with a Russian keyboard are not supported.
- crc32 = f91610bc

Keys Mapping:

 F5           -  Reset game
 Cursor keys  -  Movement of player 1
 SPACE        -  Shooting
 RETURN       -  Retry current stage
 SELECT       -  Back to selection menu (in game) / Start the game again
 1 ~ 4        -  Select 1 player game level
 5 ~ 8        -  Select 2 players game level

Joysticks:

 Joystick 1   -  Movement of player 1
 Joystick 2   -  Movement of player 2
 Button 1     -  Shooting