A leaf is a node with exactly one connection. If you click the leaf with the smallest number it disappears.
When all leaves are vanished you get to the next round where you play with an additional node.
The number of nodes is equal the the time in seconds you have got for a round. When the time is consumed the game ends.
Please read the disclaimer carefully because by downloading the apps or using the online version (see below) you agree with it!
There are localizations for English and German.
The app needs internet access as you are able to share Leaves.
The apps which can be downloaded from App Store and Google PlayStore do not submit any individual data.