Use space to place things, the arrows and the circle change the placement size.
@CraftGadgets for many ideas UPDATE LOG: 1.0 Game release! Dirt, Grass, Water, People, and Light Blast! 1.1 Nature Update! Monsters, Animals, Trees, Battle System, bug fixes, and more! 1.2 For Everyone Update! Mobile Version and smarter Animals. 1.3 Cave Update! Armor, Caves, and stronger Monsters. New materials: Wood and Iron. 1.4 Sorting Update! Added tabs to the toolbox: Landscape, Life, Structures, Destruction 1.4.5 Stronger Monsters Update! Monsters do more damage now. 1.5 Sand Update! Added Titanium, Sand, and Demons! 1.5.1 Bug Fixing Fixed a bug where mobile players couldn't summon Demons, And updated the armor graphics. 1.6 Tungsten Update! Added Tungsten, a new material, and halved the size of Demons. 1.6.5 Eraser Update! Added an Eraser. 1.7 Nature Update 2 Added Mountains, better grass, and Spawners. 1.7.5 Bless Update! Added Bless, a new tool that heals good and destroys evil. 1.8 Arcane Update! Added the Arcane Mine and a new material called Arcanite. 1.9 Ritual Update! Added Monolith, a new structure, and Demon Stones, an item that people use to summon creatures at a Monolith. Monsters are the only summonable creature so far. 1.9.5 Rarity Fixing! Made Demon Stones rarer and made magic caves less friendly. 1.9.8 Animation Update! Entirely deleted the death animation. 2.0 Diversity Update! Added snow, and different tree types depending on wether the tree is on Grass, Sand, or Snow. 2.1 Troll Update! Added Trolls, a new monster type. Trolls are too mean to take damage from weak attacks and are literally stronger than demons. 2.2 Descriptions Update! Hover over something in the toolbar to learn what it does. 2.3 Corruption Update! Added the Corrupted Monolith, placing it destroys the entire world. 2.4 Gods Update! Added Gods, a new creature. This game will most likely never receive another update. I have started development on a new World Sandbox.