itch.io

A game that has some of or all of the mechanics: Limited interaction or the ability to be played without interaction, rapid growth - often exponential, prestige mechanic(s), An end goal/mission or a general goal of getting a higher amount of currency, and a system of buying and upgrading buildings, units, or similar.

Ludum Dare is a 48 and 72 hour game making competition globally hosted twice a year publicly on the internet for anyone to participate. The 48 hour version is strictly for solo participants, while the 72 hour version is relaxed bit with more time and no restraints on team size and source code usage.