 If you liked
Ueki no Housoku
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 ...then you might like
Darwin's Game
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Apart from the gods part in Law of Ueki they are pretty similar, a bunch of people getting powers fighting eachother
Where as in Law of Ueki they get powers from Gods and in Darwins Game they get powers from an application in your phone, each power differ and have its up and downs.
The Goal in Darwins game isnt really revealed as of this point, whilst the goal tends to be clearer in Ueki no Housoku