Code Name: Viper: Dead Fox - Tranquilizer Mode

This hack adds to the game 3 playable modes and an ability to switch weapons with Select button.
- "Full ammo", "Half ammo" and 1-bullet "Tranquilizer gun" modes are available to choose from the main menu. Choose with up-down arrows - and press either Start (to go to the next menu and choose a difficulty to play) or the Select button (to continue from a password);
- On "Half-ammo" mode the starting amount of bullets and the one given in a levels will be halved;
- On "Tranquilizer gun" mode it'll always be the "last bullet" - very slow, with shortened range and silenced shot sound;
- Press Select during a game to switch between weapons.

Database match: Dead Fox (Japan)
Database: No-Intro: Nintendo Entertainment System (v. 20210216-231042)
File SHA-1: 650CD4D1631E94A1321A256B240AD4D7D47533E1
File CRC32: 48D774A
ROM SHA-1: 572F719D09C6538477AF240C81950D43B133C480
ROM CRC32: 2E1E7FD8