Blue Coin Challenge

Blue Coin Challenge is a Side Quest in Mario + Rabbids Sparks of Hope, located on all five planets.

Description
On each planet is a mechanical-looking blue Warp Pipe that houses a larger mechanical room containing a P-Switch. The Quest begins by activating it, making a set of Blue Coins appear for a limited time. Collecting all the Blue Coins in a set makes another set appear. Collecting all the Blue Coins from the last set completes the Quest and the player is rewarded with a Planet Coin from that planet, a treasure chest containing coins, and a Probe containing a Memory regarding that planet.

Beacon Beach
On the first floor of the Lighthouse, on the opposite side of the entrance.