Grounded is packed with secrets, including a hidden Four Leaf Clover. To find this secret, you will need to head toward the large waterlogged area on the east side of the map. It is not a particularly dangerous area, as it lacks any big insects that might cause you trouble. You do want to make sure you have some bandages with you, and some food, just in case.
You can make bandages from Woven Fiber. Just bring some plant fiber to an analyzer to unlock the recipe for the woven fiber. Now, head to the point marked on the map above, which will be in a pool of water, to the south of the Battletoads statue.
Make sure you have a torch equipped and then swim straight down. You will see an underwater tunnel that you can swim into. Follow it all the way to the end. It can be a little awkward, as the tunnel is filled with rocks and plants, so we would advise you do this in the first-person mode to make it easier.
When you get to the end, you will find a room with a Four Leaf Clover growing in it. You can’t interact with the clover or harvest it, but this may change in a future update. There isn’t much else in the cave, so the Four Leaf Clover is the only reason to go there at the moment, but we will keep an eye on this particular secret and update this guide if anything changes in a future update.