Introduction

Sandbox building games such as Minecraft include a Creative mode, and shines as one of the best building games, where you may have access to an unlimited number of blocks and items. 

In this guide, we will show you how to make a 'Creative mode' with MakeCode Arcade. You'll learn to create multiple block types with arrays, and use the button combo extension.

Complete this guide to make a 2D sandbox building game in MakeCode Arcade.
    • In this guide, get started with creating a simple 2D sandbox building game with the Blocks interface in MakeCode Arcade

    • With an external sprite editor (Aseprite), create a 160x120 pixel background.

    • Save it to your computer as a .png file 

    • Then drag and drop the images into the Microsoft MakeCode Asset Tool, which automatically converts the image into text.

    • In the next step, this background will be used in our code.

    • Start by placing a set background image to block within on start

    • Add a set tile map to block

    • Add a set playerSprite to sprite ... of kind Player block

    • Get out a set ... to ... block, and create a new, empty array and name it brickList

    • Create a new variable and call it i, then set this variable to 0.

    • Position the player sprite at x 50 y 200 with a set ... position to x ... y ... block

    • From the Scene tab, add a camera follow sprite block to the on start block. Pick playerSprite from the variable dropdown menu. Later, after we have added player movement functionality, when the player sprite reaches the center of the screen, the camera will track along with her. Previously unseen parts of the tile map can be traversed across.

    • For the player sprite to remain on screen, add a set playerSprite stay in screen ON block

  1. scene.setBackgroundImage(img`
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    `)
    • Replace the existing scene.setBackgroundImage code with the following in the Javascript interface.

  2. "palette": [
            "#000000",
            "#fafffc",
            "#ffeb33",
            "#a3c0e6",
            "#6275ba",
            "#ffab7b",
            "#ff6c7a",
            "#dc435b",
            "#3f48c2",
            "#448de7",
            "#2bdb72",
            "#a7f547",
            "#222533",
            "#f58931",
            "#db4b3d",
            "#a63d57"
        ]
    • While we've imported the background image into MakeCode Arcade, we'll still need to change the colour palette within MakeCode Arcade. Previously, we've done just that in Get Started with MakeCode Arcade. The steps are the same:

    • Click on hte { } Javascript button up the top of the editor to navigate over to the Javascript interface.

    • Then click on pxt.json 

    • Click on Edit Settings As text

    • Add a comma after "preferredEditor": "tsprj"

    • Paste the code after it, make sure the closing curly brace stays at the end.

    • Then, click on main.ts file in the Explorer list to refresh the game.

    • This guide uses the Taffy16 palette found in Lospec.

    • Navigate over to the Blocks interface. There will be three kinds of blocks that can be selected to be placed in the game.

      From the Functions tab, create a new function and name it brickSelection. 

    • Create three conditional statements.

      If i is equal to zero, the activeBrick variable will be set to the red brick sprite.

      If i is equal to 1, then set the activeBrick variable to the blue brick sprite.

      If i is equal to 2, set the activeBrick to the green brick sprite.

      Otherwise, if i is equal to 3, set the activeBrick to the door sprite.

    • From Controller tab, get out a on A button pressed block.

    • Add a call brickSelection block into it.

    • Previously, we created an empty array called brickList. It is here that the brick sprites will be inserted. To do so, create a brickList insert at 0 value activeBrick block. This inserts the current sprite in activeBrick to index 0 of the array, brickList.

    • Whichever block type it is, let's get it to be placed directly in front of the player sprite, specifically, it will be placed 16 pixels from the playerSprite's x position. To do so, get out a set ... position to x ... y ... block.  

    • Set the brickSprite to stay within the screen with a set brickSprite stay in screen ON block.

    • From the Math tab, get out a ... + ... block and place this within the x parameter of the set ... position to x ... y ... block. Do the same for the y parameter. 

    • Add the blocks playerSprite x and 16 into ... + ... block.

    • Let's also create functionality for removing the blocks. Create a new function and name it removeBrick. 

    • Add the blocks as shown so that on button B pressed, the last placed block will be removed. Pressing button B repeatedly will destroy the blocks all the way to the oldest placed block.

    • Arrays can be treated like a stack, where we can add elements to the top of the stack and remove the last element that was added to it.

    • In the next few steps, functionality for movement of the player sprite will be added. This can be done with the on ... button pressed  and change playerSprite ... by ... blocks.

    • First, set the on ... button pressed block to left.

    • From Sprites tab, drag and drop a change ... x by ... block into it.

    • Set it to playerSprite and -16.

    • Set the on ... button pressed  block to down and change playerSprite y by 16

    • Add another on ... button pressed  block and set it to up and change playerSprite y by -16

    • Finally, add a on right button pressed block, and change playerSprite x by 16.

    • We've used the direction buttons to control the player sprite, and button A as well as B have been used to add or remove block sprites. There is a way to add more controller functionality! One way is to use the button combos extension. To add the button-combos extension, first, click on the Extensions button.

    • Click on button-combos

    • You should then see button-combos-specific blocks found in the Controller tab over in the Javascript interface.

    • To swap between the block types, we will use a on button combination block.

    • Each time the left and A buttons are pressed, change the value of i by 1.

    • If i is bigger than 3 then, then set i back to a value of 0 with a set i to 0 block.

    • So that each block is placed exactly one after another, use a on sprite of kind Building overlaps otherSprite of kind Building block.

    • Place a change brickSprite x by 16 block in it.

    • Click on the Download button

    • Click on Meowbit

    • Drag and drop the arcade-advanced-dungeon-crawler.uf2 file to ARCADE-F4

    • Get the complete code or play the game, here.

    • In the next guide, we'll show you how to create more block types of different sizes, add animations, and multiplayer functionality by using Javascript.

    • Check out the guides over at https://www.littlebird.com.au/a/how-to/#micro-bit to learn even more. Happy gaming!