This is a homemade trainer made by the author using GameTrainerStudio for Grand Theft Auto 1.
The few similar programs for this game available on the Internet either have few functions or do not work at all. This one provides features that will make most missions in the game easier.

This trainer only for the Windows version of the game. It will not work on the DOS version.

Functions:

Infinite armor
Bulletproof cars
Receive weapons and ammunition
Silence police / Clear wanted level
Increase/decrease player's walking speed.
Increased health
Increase your score multiplier.

Usage:
Launch the trainer, then launch the Windows port of the game (GTAWIN.EXE).

The trainer will not work on the DOS version. After entering the level, press the appropriate keys to apply the desired functions.
And the author also added a bonus to the archive: “Easy Street Mod”

This modification will make levels and missions even more accessible.

Features:

Enabled second phone groups in San Andreas levels from the start (type the bug next to the phones to activate).
Added arrows to bombers and other targets that are not marked in certain missions.
Included are the main missions at level 6: Rasta Blasta without completing the initial mission (enter the initial vehicle to apply).
Special vehicles have been added for level 4: Tequila Slammer - cinema mission (phone 152 172).
Disabled speed condition at level 1: Gangsta Bang - task on the trainer's side.

Instructions:
First, you need to make a backup (backup copy) of the original /gtadata/mission.ini file, then you need to replace it with the one in the archive.

Video demonstration: