On the level VARSITY if you go to the building where you first destroy one of the. Cars of a train. There is a room in the building you can put a explosive on it and get the C96 MAUSER. (They say on the game tips to look for hidden weapons in each level but this is the only one I can find.
Cheating With Out Cheats
On the level MARKET GARDEN at the bridge with the tank, go to the right side of the bridge where it starts to arc. Climb up on the side and walk up the bridge. There will be a point you can't get up anymore so barly go to the side with out falling and go up at the same time. Then walk on top of the bridge. You can easily destroy the tank with gammon gernades or a bazooka. You can walk across the beams to the other side.
Use Caution When Using Cheat Codes
If you use a cheat code, you will NOT be able to
save your game progress until you start over
without using a cheat.
It's actually very easy to upgrade all of your
weapons. On Adanti, the Tommy Gun and the M1
Garand are the easiest to upgrade. Get a lot of
headshots and melee kills! Later on, you'll be
able to upgrade the MP40, Kar98k, Shotgun,
Panzerschrek, G43, StG.44, Springfield, Recoiless
Rifle, Colt. 45, Walther P38, Steilhandgranate,
MkII grenade, and the Gammon Grenades. Upgrading
5 weapons will grant you 25 gamerpoints and
upgrading all weapons will grant you 75
gamerpoints. You can use your upgraded weapons
online on unranked matches. Ranked matches you
have to upgrade on your own and you get an
achievement for it! Good luck!