如何输入：
1、在游戏主菜单上有个额外内容(extra)点进去有shift code这个按键。
2、进去后需要注册shiftcode的账号然后在游戏的输入界面打上code代码就能兑换。
兑换码：
ZFKJ3-TT3BB-JTBJT-T3JJT-JWX9H
C35TB-WS6ST-TXBRK-TTTJT-JJH6H
KJ5JB-X6WHJ-XRTFC-B3B33-WHKZC
C3W33-RZ6ZJ-TFJ6C-TTJ33-RFHX5
53KBB-KXXRC-RZ66Z-WFJBB-WSRZ3
WT5JB-T9KZB-XFT6W-TTTTB-W5WJB
5BKB3-ZF5ZJ-66BRW-33J33-TS3CF
5B3BJ-XZWFW-T3KRZ-JBJTB-6WST9
ZFKJ3-TT3BB-JTBJT-T3JJT-JWX9H
W353J-RR6RC-X96R9-C63J3-RJTFW
WJ5TB-BJSZJ-TFB6W-JTJJJ-3Z3CB
CTKJB-KBXJ9-BJXJS-3TB3J-3ZCBK
KJKJT-WHBKX-HC9BT-TJBJ3-XJFSJ (Axton's Head**) (8/13/13)
CBKBJ-6ZJW6-HKH3T-B3T33-F5ZRS (Gaige Head**) (8/14/13)
CT5BB-XTW5X-9CSBT-3BTTJ-FT5X5 (Zeros's Head**) (8/19/13)
KTC3T-WTW5F-ZCHB3-BT3B3-XJ9WR (Maya's Head**) (8/19/13)
CBKBB-ZHJC6-SWHJT-JJ3BB-3CXHS (Krieg's Head**) (8/19/13)
WBCJJ-33KWR-S5Z33-BJTTB-65WJJ (Salvador's Head**) (8/19/13)
K3K33-SFH5X-WBX5B-BJB33-Z9J3F (Halloween Skins) (10/31/13)
KTK3J-FR3JS-ZX55B-B3BJ3-HSRB6 (Axton's Skin**) (11/15/13)
535BB-3R3BZ-HF5K3-JJB33-3BF3J (Gaige's Skin**) (11/15/13)
CTKJ3-9CBJS-9R5WT-JBJ3T-WKXKF (Zero's Skin**) (11/15/13)
CBCJ3-W5TT9-S65K3-BJJ3B-XHWWC (Maya's Skin**) (11/15/13)
CBKJ3-5FT39-ZRCCT-JTJB3-RFJ5B (Krieg's Skin**) (11/15/13)
5J5TT-RCJBS-ZXWCJ-TJ3BJ-TK3FB (Salvador's Skin**) (11/15/13)
WTCBJ-FTCXF-5TXCT-3TJ33-TZXW6 (Kreigs V-day Skin) (2/25/14)
5JWT3-3H5FB-SCBX5-TJ3JB-H5R6X (St. Patty's Day Skins + SMG) (3/14/14)
CJKBJ-3XWTF-HCJ6K-JJB3T-SB35X (NEWWW Axton as Athena) (8/29/14)
CTWTB-RXKTR-SKJXW-3TBTJ-KXKKH (NEWWW Salvador as Wilhelm) (8/29/14)
KBWT3-WF5TR-SC3XW-T333B-TSCTS (NEWWW Maya as Nisha) (8/29/14)
W3C33-H653X-9CTR5-3TBJ3-HZ99S (NEWWW Zer0 as Claptrap) (8/29/14)
53WT3-59KJX-95B65-3J333-S9JW9 (NEWWW Gaige as Moon Moxxi) (8/29/14)
CTKTJ-JSWJF-SCJXK-3TJJ3-RWTKX (NEWWW Krieg as a Scav) (8/29/14)
CTWTB-JTBW5-KFTTT-JTB33-JTBWB (2 key)
C35BJ-SRBF6-5TFKB-BBTJT-FSBZK (5 Keys) (15-12-15)
5BC33-CRJRF-WB6WB-3TTTB-655ZX(5 Keys) (15-12-15)
CT5JB-FSTFX-5TF5T-3JJTT-6CF6T (5 Keys) (15-12-15)
WJW3B-5HBR6-5BXCT-33TJ3-WXT53 (5 Keys) (15-12-15)
535TJ-3JC6X-KJXCJ-BTBBT-K5WFR (5 Keys) (15-12-15)
5BW3B-F96CT-KXJFK-TB3B3-39BWZ (20 Keys)(15-12-15)
5JWTT-KHTSB-S5TXC-BB33J-HCJ6K (5 Keys) (15-12-15)
CJC33-RH3ZB-9KTX5-3T3JJ-SXFRK (5 Keys) (15-12-15)
KJ5BJ-H9BHT-HCJ65-33JJ3-HTXZZ (5 Keys) (15-12-15)
K353B-TWSBX-H5BR5-J3T33-6XTCK (5 Keys) (15-12-15)
WBK3T-BKW6T-TXTRK-JTTBT-C6BS5 (25 keys)
CJWJJ-HR5Z9-6JT3J-J3TBT-6TJ6K (5)
5BWBT-RX5ZH-FJBJB-JBTJT-CRBWX (5)
WTCTJ-J9CS9-RJJ33-T3J3B-BT9XH (5)
C35JB-R9WSH-XBBJT-JJ33B-F3WFB (5)
K3WBT-Z95HZ-FTT3J-BTTJB-ZFX63 (5)
K3CB3-3JF99-RJ3JB-JJ3JJ-BT3RX (5)
W3KJJ-KJXHZ-6JJBJ-3TT3T-33XBR (5)
C3CTJ-XJ6HZ-FJTTJ-JBBBJ-3WTJZ (5)
WTKJ3-9JXZ9-6TJJB-33T3J-FRJC6 (5)
5JKBJ-K9WHW-WBZTJ-T3TTB-TW9HR (1 Key, axton class mod+ more 7/9/13)
W3C3B-5JRZC-WJH33-JBJJB-9S6CJ (Gaige Class Mod) (7/10/13)
CBWJ3-S5CJ3-WTTCF-WX333-9STBF (Zero0 Class Mod) (7/11/13)
WJWJ3-FXC33-KT3CR-KR33J-J9B35 (Maya Class Mod)
WTCJT-J653B-C3TKF-5X333-F6JRH (Krieg Mod) (7/13/13)
WJKBB-KXC3J-5BBCR-5X33J-XZ6RZ (Sal class mod) (7/14/13)
K3WTT-TKRH9-X3BJT-BJTBT-KXTSB (5)
KBKJB-S5FSZ-FTTTT-TJJJB-XC95X (5)
WB5JJ-KX6HS-XBJBT-TBJJB-XW3S3 (5)
KJ53B-RRRSZ-F3TJJ-TJTT3-WBHT6 (5)
W353B-9FXZZ-RBJ3J-BT3B3-JK9KH (5)
WTWJ3-TSXZS-FTJB3-3TTJJ-WBCT3 (5)
CJW3J-KHXZH-63TTJ-T3J33-R5HXK (5)
K35JT-ZKXXJ-TFTRK-JB3JB-SC65Z (5)
CBWJ3-6HRZS-6TJJ3-3BJBT-WH3TZ (5)
KT5T3-HS6HZ-FBJT3-3TJT3-ZC5KH (5)
WBCTT-XX3RK-HK6TB-TTTTT-B5Z53 (5 Keys) (15-12-15)
CJKJB-XWBR6-WJXKJ-JB3TB-WTCWX (5 keys) (15-12-15)
CBCB3-SW36X-KJXW3-TTT3J-SFBSB (5 keys) (15-12-15)
C3WBB-W3BRR-5J6WB-3JJJJ-35ZKZ (3 Keys) (15-12-15)
KTK3J-JWT6X-KB65T-3JJ3J-WHBRT (3 Keys) (15-12-15)
CJ5B3-6TTFF-5365T-TBJBB-SKTCB (3 Keys) (15-12-15)
CJ5T3-K5TF6-5TRC3-TBTJB-HZ5ZF (3 Keys) (15-12-15)
W3CTJ-BFTFR-KJRK3-JJT3J-H6H36 (5 Keys) (15-12-15)
5B5TB-XFBX6-WBXWJ-JJ3TJ-ITEMS
5T5B3-CWJSK-KRTJT-TTJJT-9HW63 (IGN GOTY Judgment Day; 2 key)
KJ5BT-FBKSK-KXJ3T-3BTJT-FJX5C (Claptrap Webseries; 2 key)
K3K33-3W9JT-6XJJT-TB3JB-HWZZF (Gearbox Award Celebration; 5 keys)
KBWJJ-WTXB9-C59J6-WFBTJ-TK6BJ (GDC 2013: Humor in BL2)
WTC3B-Z5ZWC-HW6JT-JJJBJ-9FWXR (2 key)
K3WJT-BFBRW-S5RTT-TBBB3-9XWZ5 (Facebook; 5 keys)
KBC3J-95WXF-WBSBT-TTJJB-KTC6K (3 Keys) (15-12-15)
KB53J-RW5XX-539BT-BJT3J-CC55T (3 Keys) (15-12-15)
WB5TT-JFCXX-CBS33-TTTBJ-JJ95B (3 Keys) (15-12-15)
K3CBT-CRKR6-CB9BT-T3TBJ-595J3 (3 Keys) (15-12-15)
CTC3J-KR9H5-WTZ3T-TJ3TB-6SRRJ (5 Keys) (15-12-15)
