As previously mentioned, the 2-4 is the hardest of the 3 modes, with the 1-19 being the easiest.
My main quarrel with this game is that all the nodes are ticked at start. At every new game I spend unnecessary time unticking everything. I don't know how others are playing this game, but atleast an option for this would be great.
Great game. Challenging and fun with amazing relaxing music.
Awesome game, very calm and addictive. The endless mode adds infinite playtime to the game and it is quite challenging on 8x8. This kind of game needs an app release because it looks like it is designed to be played on a device. 10/10 would sum numbers again
very smart game... nice design. i would pay for this on iphone
It's now available on App Store for free :) https://itunes.apple.com/us/app/rullo/id1200714079?mt=8
It's very simple and sofisticated; one action solving many problems at once, elegant, the colors are very easy on the eyes and challenges you to think! It is very enjoyable!