You will have to go through hordes of monsters! After all, Herobrine kidnapped Nubik's brother! Craft weapons, upgrade them, use them to defeat enemies. Become a Hero and save your brother!
Control for PC: Walking - arrows/WASD Attack - press LMB Weapon Crafting - Drag the weapons in the inventory to the same weapon to get an upgrade. And if you decide to fight through the screen of your mobile device, then: Walking - control takes place through the on-screen joystick Attack - the sword button on the screen