Ryau the Jellyfish 3

Ryau the Jellyfish 3 (or Ryau 3 & WADDLE on the boxart) is an platforming game made by Raison.

It introduces an creature named Waddle the Puffball, who he is the result of an failed science experiment by Doctor Swaddle.

Gameplay
Gameplay is similar to Ryau the Jellyfish (and it's sequel).

However, there are new bonus levels, which have graphics similar to that of the Zerona 32.

The goal is to eat enough zooplankton and collect wood and jam so that Ryau can craft a Havoc Diamond.

Plot
During Ryau and Fins' vacation, an new lab is built near the island they are on. Ryau decides to check the lab. Since they see the new plan, they see an electric piston with Waddle in it.

Then, Waddle joins.