Serious Sam 3: BFE - Coin-Op Co-Op item locations

Item Count: 24
Small Treasure: 17
Medium Treasure: 4
Large Treasure: 2
Extra Life: 1

Item Count: 36
Small Treasure: 28
Medium Treasure: 5
Large Treasure: 2
Extra Life: 1

Item Count: 30
Small Treasure: 21
Medium Treasure: 4
Large Treasure: 2
Extra Life: 3

Item Count: 38
Small Treasure: 29
Medium Treasure: 5
Large Treasure: 2
Extra Life: 2

Item Count: 23
Small Treasure: 14
Medium Treasure: 4
Large Treasure: 2
Extra Life: 3

Item Count: 24
Small Treasure: 15
Medium Treasure: 4
Large Treasure: 2
Extra Life: 3
+A bonus item available even outside Coin-Op Co-Op!

Item Count: 29
Small Treasure: 21
Medium Treasure: 3
Large Treasure: 2
Extra Life: 3

Item Count: 30
Small Treasure: 19
Medium Treasure: 5
Large Treasure: 2
Extra Life: 4

Item Count: 33
Small Treasure: 23
Medium Treasure: 5
Large Treasure: 2
Extra Life: 3

Item Count: 29
Small Treasure: 20
Medium Treasure: 5
Large Treasure: 2
Extra Life: 2

Item Count: 30
Small Treasure: 20
Medium Treasure: 4
Large Treasure: 2
Extra Life: 4

Item Count: 21
Small Treasure: 10
Medium Treasure: 4
Large Treasure: 2
Extra Life: 5

Item Count: 15
Small Treasure: 11
Medium Treasure: 2
Large Treasure: 1
Extra Life: 1

Item Count: 21
Small Treasure: 15
Medium Treasure: 3
Large Treasure: 1
Extra Life: 2

Item Count: 26
Small Treasure: 19
Medium Treasure: 2
Large Treasure: 3
Extra Life: 2

Q: How are you so sure you found all the items?
A: Because I used the Serious Sam 3 editor. I load a level, bring up the entity list and count how many treasure items there are per level. Then I use the editor to find their locations.