If you happen to save your game with low health, zero ammo, and a broken gas mask right before a checkpoint, a trainer can save you from having to restart the entire chapter from scratch. Important Safety Tips
FLiNG trainers typically offer a comprehensive suite of options. Here are the most common functions you can unlock for Metro 2033 Redux : metro 2033 redux trainer fling
If you want to speed up backtracking or explore out-of-bounds areas to see how 4A Games built the levels, the speed and jump modifiers alter the game engine's physics to let you zip across the maps. How to Download and Use the Trainer Safely If you happen to save your game with
If you want to alter your playthrough or need help with a specific part of the setup, let me know: How to Download and Use the Trainer Safely