Primordial Ooze, known in Europe as Raining Lake, and known in Japan as Jungle River (ちゃぷちゃぷいけ, lit. "Jungle River"), is the second level in Ape Escape and Ape Escape: On the Loose. It is the second level in The Lost Land.
On a rainy day, Spike is bound to catch 4 monkeys. A Plesiosauria is wandering in the water, and Spike can get on it in order to go to the other side of the area or to reach unaccessible area, where a monkey is located (however, when Spike will obtain the Sky Flyer, he will be able to reach this area without the creature's help).
A Specter Coin is located underneath the platform where Spike starts.
- The Plesiosauria (not to be confused with a dinosaur) share high similarities to Dorrie from Super Mario 64.
- This stage was originally named "Wetlands" in the Pizza Hut Demo.
|Characters||Casi · Jake · Natalie · Professor · Specter · Spike|
|Gadgets||Dash Hoop · Magic Punch · Monkey Radar · R.C. Car · Sky Flyer · Slingback Shooter · Stun Club · Time Net · Water Net|
| || |
|Prehistoric Era/ The Lost Land||Fossil Field · Primordial Ooze · Molten Lava|
|Cenozoic Era/ Mysterious Age||Thick Jungle · Dark Ruins · Cryptic Relics|
|Dimension/Dimension X||Stadium Attack|
|Primitive Age/Oceana||Crabby beach · Coral Cave · Dexter's Island|
|Ice age/New Freezeland||Snowy Mammoth · Frosty Retreat · Hot Springs|
|Dimension/Dimension X||Gladiator Attack|
|Recent Past/Medieval Mayhem||Sushi Temple · Wabi Sabi Wall · Crumbling Castle|
|Present-Day/Futurama||City Park · Specter's Factory · TV Tower|
|Present-Day 2/Specter Land||Monkey Madness|
|Dimension/Dimension X||Peak Point Matrix|