Longvinter is a small-scale indie multiplayer survival sandbox, released by Uuvana Studios. It has received modest interest in the niche of cozy/survival games but has not broken out as a mainstream hit. As a recent release, there is a short-term peak expected, but as an indie with no major publisher, its daily active players are likely in the low thousands. It is not structured as a massive persistent world with hundreds or thousands of concurrent players, so it does not meet MMO criteria.