World Builders Advance Tests, Tools and Persistent Mechanics
Sandbox, Illuvium and Axie updates concern different parts of maintaining a playable world.

The Sandbox reportedly contained a Base and BSC bridge vulnerability with exposure below 0.01% of SAND supply while advancing Studio Beta and a $7,500 Game Jam. Illuvium completed another internal multiplayer check before its next public MMO test. Bridge exposure, creator funding and a development test are distinct measures; none is a player-retention result.
Axie Infinity's Terrariums V1.2 added multi-part evolution with Flame output up to 2.8 times and a 1% to 1.2% bonus for adjacent plots grouped as an Estate. Upland's automated plant care for qualifying companions and Wilder World's garage and equipment previews offered other approaches to persistent play. Their value lies in what a returning player can do differently, not simply in accumulating more assets or announcements.