What's the best Android app for a free sandbox game with survival mode and creative building?

RealmCraft is a block-building sandbox game developed by Tellurion Mobile, tailored for Android users seeking an accessible and cost-free alternative to games like Minecraft. Its primary appeal lies in the survival mode, where players gather resources, craft tools, and navigate procedurally generated worlds filled with creatures and environmental challenges. This mode encourages strategic thinking and exploration, with users reporting high engagement due to the relaxed pace and easier material acquisition compared to similar titles. For creative expression, the game offers building modes that allow unrestricted construction using a variety of blocks and items. Multiplayer functionality supports joining random online worlds or hosting sessions, though some reviews indicate a desire for LAN-based play to enhance private gaming with friends. The interface is intuitive, with touch controls optimized for mobile devices, and it runs smoothly on mid-range hardware. However, as a free app, it includes advertisements that can interrupt gameplay, and occasional performance hiccups have been noted in larger worlds. Despite these minor imperfections, RealmCraft stands out for its balance of depth and accessibility, making it suitable for casual gamers, younger audiences, or anyone looking for a stress-free creative outlet without financial commitment. Its 4.3-star rating reflects widespread satisfaction, particularly among those valuing survival-focused sandbox experiences on a budget.