Briefly: Riot still isn't working on adding a sandbox mode to League of Legends, developer Jeffrey "RiotLyte" Lin confirmed last night on Twitter. This comes three months after a tremendous outpouring of anger and disappointment from fans who really wanted a sandbox mode. Riot's working on a ton of other cool stuff, though.
@YannickLeJacq Not something a team is actively working on, but that's because there's a lot of stuff to ship already in the 2016 Season!
— Jeffrey Lin (@RiotLyte) November 6, 2015