Level passwords:

2 - EXTREME 
3 - EXCITE 
4 - EXCAVATE 
5 - EXCALIBUR 
6 - EXTORT 
7 - EXPIRE 
8 - EXACT 
9 - EXHALE 
10 - EXHUME 
11 - EXONERATE 
12 - EXPEL 
13 - SEVERE 
14 - SURVIVE 
15 - SAVANT 
16 - SUFFER 
17 - SULPHER 
18 - SERVE 
19 - SEETHE 
20 - SEVERAL 
21 - SEVERANCE 
22 - SAVAGE 
23 - SACROSANCT