step 1 round 6-7
stay in the lobby(first room)until round 6-7 building up points same as normal shoot leg 5 times then knife
step 2 round 7-9
going into mp40 room and buy mp40 and the stakeout (if the box is there dont get it until u have juggernog)then stay there until round 9
step 3 9-15
open up to the power ( if u dont have a juggernog amount 2500 then dont turn on the power until u do)and buy juggernog and then go to the box and try to get the ray gun and thunder gun combo if u dont thats life try again once u get it pack a punch those babies
step4 15+
now dont get carpenters and do the the stage route it could get boring so u can do something else once u have done all of these steps just take it easy because the game will be easy except it be harder at round 30+ because the ray gun gets crap but the thunder gun doesnt

plz rep if this helped and thanks for viewing this topic hope it helped