This is an entry for Fortnightly Topic Challenge #44: Introduce a new grid deduction genre to the community.
Greener Grasses is apparently a new genre of grid puzzle. Pitched by Joseph Howard and executed by a friend of mine, Ivan Koswara a.k.a chaotic_iak. This was first appeared in 24-Hour Puzzle Championship 2018 and lately revived in Ivan's 25 Years in Logic Masters India last month (November 2020).
When I first trying to solve this genre, it took me a long time until I grasped the idea and then hooked to explore more of this genre. Stated by Ivan in the 25 Years, the number of published Greener Grasses puzzles apparently can be counted on one hand. So here I am, trying to pick this one up as I do believe the genre has a great potential~
Also, as this is the entree on the genre here, I write this in a "classic" way (with... a supposedly-not-too-hard difficulty...) I personally recommend you to check the puzzles in the 25 Years to see how neat this genre can be! :)
Nb. Uhh.. Look at me getting invested in it by writing a cute puzzle as the example... >w<
Nb2. Ok, I asked Ivan to playtest this... And it looks like this is harder than I expected... Oh well... ><
Rules of Greener Grasses:
- Divide the white cells into regions of the indicated size (top-right of the grid.)
- Whenever two regions share a side, each region has something the other does not: a symbol that the other region has less of. (For example, a region containing AA and AB may share a side: the AA region has more A's than the other, and the AB region has more B's than the other. But AB and B may not share a side; the B region doesn't have anything the AB region doesn't have.)