Helium Voices Extra
Cost to Buy: 5,000,000
Requirements: Dumbbells
Talk to Rukus. He wants a set of Dumbbells. These can be found in the Rhino Canyon level in Story mode. Bring them back here to unlock an Extra that makes your characters have high voices when they talk.
Treasure Detector Extra
Cost to Buy: 250,000
Requirements: Ordinary Rock
Runk is looking for the Ordinary Rock. You can find it in the Rhino Caves level in Story mode. Bring it back to Runk and he will unlock an Extra that helps you find treasure that you need to unlock more Extras.
Rhino Brawler Character Token
Cost to Buy: 10,000
There are three crocodile statues scattered about the two scenes—one in the first scene and two in the second scene. Seek them out and destroy them. The first two are fairly easy to find. To get the last statue, you need to drop down onto a wooden platform from the ramp leading down from scene 1 and then walk across a tightrope. The character token appears when you destroy the third statue.
Rhino Fighter Character Token
Cost to Buy: 10,000
Turn a crank to lower a rock wall. Another rhino runs into it and gets stuck. Switch to a rhino yourself and charge attack the wall from the opposite side. When it breaks, you are rewarded with a character token.
Wolf Tribe Wheel
This wheel is located behind double locked doors. Use a wolf to dig up some pieces to assemble a climbing wall. Climb the wall and push a stone rhino head off a platform to the ground. Assemble the pieces into a switch and pull it to open one door. Break a rock wall with a charge attack by a rhino, then switch to a nomad and crawl through a hatch to get to a higher platform. Push another stone rhino head to the ground and assemble another switch. This opens the second door so you can get the wheel and add it to your collection.
Nomad Tribe Bio
This bio is behind two locked doors. To open it, you need to use a rhino to charge attack two rock walls to either side of the doors. Then switch to a gorilla and power punch the red switches located behind the rock walls to open the doors.
Rhino Caves Bio
Turn a crank to rotate a maze puzzle. You need to get two balls into two slots in order to earn the bio as a reward.