some of these puzzles are pretty hard, i've listed them in order of difficulty. All of them are related to Civilization though.
_______________
7:5
11:7
18:13
30:?
(solved)
_______________
G:2
H:5
W:?
(solved)
_______________
21:4::37:?
(correct answer given/solved)
_______________
PY:OE
CR:SE
WG:GY
PS:?
(solved)
_______________
STR
TE:QE
TT:HA
TK:?
(solved)
_______________
23, 19, 12, 13, 18, 7, 9, ?
(solved)
good luck
_______________
7:5
11:7
18:13
30:?
(solved)
_______________
G:2
H:5
W:?
(solved)
_______________
21:4::37:?
(correct answer given/solved)
_______________
PY:OE
CR:SE
WG:GY
PS:?
(solved)
_______________
STR
TE:QE
TT:HA
TK:?
(solved)
_______________
23, 19, 12, 13, 18, 7, 9, ?
(solved)
good luck