I still haven't made my way through all of the 2015 problems yet. But I don't play the game correctly any way: instead of trying to solve the problems as fast as I can, I try to write well-documented easily maintained code which runs fast. Balancing 'easily maintained' and 'runs fast' takes a little more time than 'just solve it' _and_ I'm planning on working my way through the problems chronologically, so I doubt I'll get to the 2024 problems any time this decade.