When you meet up with Andrew the Smithy, he leads you to the cart you are to get on so you can sneak past the Nazis and the Reds and continue to Polis. When you climb inside the luggage area, if you look to the left and down in front of you, you will see a Russian copy of the book the game is based on, Metro 2033
If you gather enough positive points (small flashes of light accompanied by dripping sounds), at the end of the game, after you set up the laser devive then you can just leave it and you will see an alternate ending. It will be the Dark Ones saying they only wished to make peace.
Alter game files at your own risk and always make backups. Navigate to the game folder, find the user.cfg file and open it in a text editor. Change the following lines and save cahnges for the desired effect.
Change g_global_god off to g_global_god on and change g_god off to g_god on for God Mode
Change g_unlimitedammo off to g_unlimitedammo on for unlimited ammo.
At Armory Station, before climbing into the train car, you can purchase a Sneaking Suit for 100 military cartridges from the vendor across from the Ammo Exchange.
Note that the vendor next to the Stealth Suit vendor sells an Armor Suit which will decrease the damage Artyom takes (both suits can be worn, but only the last one visibly reflected on the body model).
At Polis, a vendor next to the Ammo Exchange sells a similar Armor Suit (same price as the other suits).
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