Number of levels in each world or levels file
(in the order that the worlds are listed in Levels.PRX)
-------------------------------------------------------

PRX file    World name        # levels

JungleL     Jungle World      24
WackyL      Wacky World       19
TubeL       Industrial World  19
GearL       Gear World        20
MonaL       Mona World        20

CoopL       Cooperative       17
DeathL      Deathmatch        12

IntroL      World Hub         1
CreditL     Credit World      11
TutoL       Tutorial          22

CreditL     Credit World      3     (this is the Joke Credits)

------------------------------------
Single-player Total:          139
Multi-player Total:           29

+ Beta level examples         7           
------------------------------------
Grand Total:                  175


I verified these numbers by looking inside each PRX file that
contains levels.  So, I believe that this is likely to be the
"total count" and that there are no more hidden levels anywhere.