Your in-game character holds a moss clump, which looks like this:
That is your "life". You also have several "extra lives" (spare moss clumps). You earn an extra life every 10,000 pts. You also get a bonus for every extra life you have remaining at the end of a level.
In the middle of the screen (island), you have a water puddle, which looks like this:
Your goal is to protect this at ALL costs! You may have extra lives remaining, but if you lose all your water, the game is over! Period! You only have ONE water puddle. So, protect it with your life... because if you fail to do that... your moss clumps are useless without moisture. Every time a Lava Beast touches the water, you lose 10% of your water and it shrinks a little. As long as you have water remaining, you're good. You also get a bonus for every % of water you have remaining at the end of a level.
Your enemies are called "Lava Beasts". They look like this:
They come out of the lava and head directly for your water puddle. They're very single-minded, so they will not divert from their goal, which is the elimination of your water supply. This makes them easy to kill, individually, but... there are lots of them! An endless onslaught of them... level after level! So, don't think it's going to be a walk in the park... or else you'll be pushing up daisies in the park!
In Simple (1st difficulty), tap on top of each Lava Beast and your moss clump will automatically move there, to intercept/kill it. Your moss clump will also automatically return to the water, when it's dried out. In successive difficulties, you need to touch/drag the moss clump where you want it to go. Be sure to return to the water from time to time as well to moisture up your moss clump, or it will dry up and you'll lose a life. There are many things we haven't mentioned on this page, for good reason. You'll discover them as you play. Enjoy!