You can start this mini-game by disembarking at Jungle: Tunnel. From here just jump inside the log to begin the mini-game. Your objective is to collect fruit and there are 10 pieces per stage. Each stage connects to the next one so you'll end up going through the first few stages often since you have to restart to unlock the next stage.
The first three fruit are on the left, the next three are on the right, then three more are right down the center. When you reach the branches jump over the first then swing to smash the second. Jump over the third and in the middle of your landing area is the 10th fruit. You receive an Elixir for getting all 10, and if you are going to Stage 2 go left.
In this cave you'll find the first six fruits in the middle, two groups of three. The next three are in a larger open area but still relatively centered. After grabbing these three take a sharp right to reach the 20th fruit and receive an AP Up for your efforts. If you're headed to Stage 3 take the left path at the split.
The first three fruits are dead center. Hug the left edge around the curve to get the second group of three then return to center for the next group of three. The final fruit is just ahead dead center. For getting 30 fruit you'll receive a Dark Matter . Stay right at the split to reach Stage 4.
There are four fruits right in the center of the track. Ignore the branch that hides the last one, it doesn't hurt you. Stick to the right around the curves to grab two more fruit then cut back left quickly to grab the remaining four. You receive a Defense Up for picking up the first 40 fruit. Go left at the split to reach Stage 5.
All the fruit is in the center. It might be a bit deceiving with all the water but for the most part, it's all right in front you. Collect them all to reach 50 total and receive a Power Up .