This is the story of how I got to round 36 solo.

Round 1: Just shot them then knifed them, ended up with 1220 points.
Round 2: Same as round 1, then I opened the stairs and did the random box, got a type 100.
Round 3-9: Just killed with type 100.
Round 10-20: Got wunderwaffe and MG42. This is too easy!
Round 21-36: Same as before but with bouncing betties. Died