All Weapons:
When you are playing hit kill them all and then you will get all the weapons.

Chess board walkthrough:
OK get a piece of paper.Put A-L on the left side.Put 1-12 on the bottom of the page.Make 12 rows going down and 12 across.now do like this
the first spot to jump would be 1=E1 then the second spot would be 2=c2 etc.etc.
1=E1
2=C2
3=A3
4=B1
5=D2
6=F1
7=G3
8=H1
9=F2
10=D1
11=B2
12=A4
13=C5
14=A6
15=B8
16=A10
17=B12
18=D11
19=E9
20=F11
21=H12
22=jump on right hoarse symbol and thats it.
Do this in order and you will meet Electra steel(AHHHH)I read on the internet somewhere that you play this chess board like battleship.Thats how I beat the game.hehe.Have fun