255 grenades:
Change your weapon to the grenades and hold Z until the throw meter is filled .When the grenade is being thrown, hold Z again until the meter is full. Repeat until you are on the last grenade. When it is thrown, you will have 255 grenades. Note: This trick can be done with regular or flashbang grenades.

Level select:
Enter VZRFTMQ2G8SQ as a password for the recruit difficulty setting. Enter FZJFTMR2G8RQ for the veteran difficulty setting.

Level	Name	Recruit	Veteran	Elite
2	Red Wolf	12D1S2Q22MQQ	1ZL1S2RF2MQQ	1ZB1S2S22M??
3	Sun Devil	BJDBC3Q22WQQ	BJJBC3RF25QQ	BJBBC3S225??
4	Eagle Watch	BZDBSMQZZ!QQ	BZJBSMRF28RQ	BZBBSMS22888
5	Ghost Dance	CJTCCQQ2FGSQ	CZBCS5RFFMRQ	CJDCCQS2F288
6	Fire Walk	K2TK65Q2F4SQ	DJBDCYRFF5RQ	CZDCSWS2FMQ8
7	Lion's Den	T2TT68QGF!WQ	DJDDC6R2FWR8	DJBDCYS2F5??
8	Deep Magic	5JR5L1QGGGSQ	LZBDS8R2F8RQ	DZBDS8S2F???
9	Lone Fox	52T572Q4G4SQ	MJB2D1R2G2RQ	2JB2D1S2G2??
10	Black Star	VJVVLJQGGWSQ	2ZB2T2R2GMQQ	2ZB2T2S2GM??
11	Wild Arrow	VZVVXMQ26!SQ	FJJFD3R2G5RQ	FJDFD3S2G5??
12	Mystic Tiger	VZRFTMQ2G8SQ	FZJFTMR2G8RQ	FZDFTMS2G888