We are releasing a new DLC with 13 levels today*! It is about binary trees and binary search trees, their definition and implementation. https://store.steampowered.com/app/2807750/functional__trees?utm_source=functional&utm_content=update It is free and should appear in your list of problems as soon as you download it. * Mac version is only currently available for Apple Silicon builds, and needs to be opted in through Betas > "experimental". At the same time, we're releasing our new game, Liquidum: https://store.steampowered.com/app/2716690/Liquidum?utm_source=functional&utm_content=update It is an abstract logic grid puzzle game, based on picross, but with many additional mechanics. Is it easier than lambda calculus? Find out!