Kidblock is described as 'is: Building, exploring, world sharing, multiplayer, mobs, rocket launchers, lasers, TNT, swords, crafting, mining, farming, protecting, gameplay recording and much more!' and is a Crafting Game in the Games category. There are more than 25 games similar to Kidblock for a variety of platforms, including Windows, Mac, Linux, Android and iPhone. The best alternative is Minecraft. It's not free, so if you're looking for a free alternative, you could try Minetest or MineClone 2. Other Kidblock like games are Terasology (Free, Open Source), Creativerse (Freemium), Voxelands (Free, Open Source) and Infiniminer (Free, Open Source).