For this challenge we are creating a game of Tetris to play on the BBC micro:bit.
The game will be based on the following four shapes:
The game will use the following inputs:
- Button A: Move current brick to the left
- Button B: Move current brick to the right
- Button A and B simultaneously: Rotate current brick clockwise
Video Demo
The game will use the LED screen which consists of a 5×5 grid of 25 LEDs.
Each LED can be on (value: 9 for maximum brightness) or Off (value: 0)
The side/borders of the grid will note be displayed.
The Python code will use 2-dimension arrays (list of lists in Python) to store the main grid (7×5) and the current brick (2×2)
To test this code you will need to use the Python Editor from the micro:bit website.
Python Code
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from microbit import * from random import choice #Set up the tetris grid grid=[[1,0,0,0,0,0,1],[1,0,0,0,0,0,1],[1,0,0,0,0,0,1],[1,0,0,0,0,0,1],[1,0,0,0,0,0,1],[1,1,1,1,1,1,1]] #Store a list of 4 bricks, each brick is a 2x2 grid bricks = [[9,9],[9,0]],[[9,9],[0,9]],[[9,9],[9,9]],[[9,9],[0,0]] #select a brick randomly and position it at the center/top of the grid (y=0,x=3) brick = choice(bricks) x=3 y=0 frameCount=0 #A function to return the maximum of two values def max(a,b): if a>=b: return a else: return b #A function to hide the 2x2 brick on the LED screen def hideBrick(): if x>0: display.set_pixel(x-1,y,grid[y][x]) if x<5: display.set_pixel(x+1-1,y,grid[y][x+1]) if x>0 and y<4: display.set_pixel(x-1,y+1,grid[y+1][x]) if x<5 and y<4: display.set_pixel(x+1-1,y+1,grid[y+1][x+1]) #A function to show the 2x2 brick on the LED screen def showBrick(): if x>0: display.set_pixel(x-1,y,max(brick[0][0],grid[y][x])) if x<5: display.set_pixel(x+1-1,y,max(brick[0][1],grid[y][x+1])) if x>0 and y<4: display.set_pixel(x-1,y+1,max(brick[1][0],grid[y+1][x])) if x<5 and y<4: display.set_pixel(x+1-1,y+1,max(brick[1][1],grid[y+1][x+1])) #A function to rotate the 2x2 brick def rotateBrick(): pixel00 = brick[0][0] pixel01 = brick[0][1] pixel10 = brick[1][0] pixel11 = brick[1][1] #Check if the rotation is possible if not ((grid[y][x]>0 and pixel00>0) or (grid[y+1][x]>0 and pixel10>0) or (grid[y][x+1]>0 and pixel01>0) or (grid[y+1][x+1]>0 and pixel11>0)): hideBrick() brick[0][0] = pixel10 brick[1][0] = pixel11 brick[1][1] = pixel01 brick[0][1] = pixel00 showBrick() #A function to move/translate the brick def moveBrick(delta_x,delta_y): global x,y move=False #Check if the move if possible: no collision with other blocks or borders of the grid if delta_x==-1 and x>0: if not ((grid[y][x-1]>0 and brick[0][0]>0) or (grid[y][x+1-1]>0 and brick[0][1]>0) or (grid[y+1][x-1]>0 and brick[1][0]>0) or (grid[y+1][x+1-1]>0 and brick[1][1]>0)): move=True elif delta_x==1 and x<5: if not ((grid[y][x+1]>0 and brick[0][0]>0) or (grid[y][x+1+1]>0 and brick[0][1]>0) or (grid[y+1][x+1]>0 and brick[1][0]>0) or (grid[y+1][x+1+1]>0 and brick[1][1]>0)): move=True elif delta_y==1 and y<4: if not ((grid[y+1][x]>0 and brick[0][0]>0) or (grid[y+1][x+1]>0 and brick[0][1]>0) or (grid[y+1+1][x]>0 and brick[1][0]>0) or (grid[y+1+1][x+1]>0 and brick[1][1]>0)): move=True #If the move is possible, update x,y coordinates of the brick if move: hideBrick() x+=delta_x y+=delta_y showBrick() #Return True or False to confirm if the move took place return move #A function to check for and remove completed lines def checkLines(): global score removeLine=False #check each line one at a time for i in range(0, 5): #If 5 blocks are filled in (9) then a line is complete (9*5=45) if (grid[i][1]+grid[i][2]+grid[i][3]+grid[i][4]+grid[i][5])==45: removeLine = True #Increment the score (10 pts per line) score+=10 #Remove the line and make all lines above fall by 1: for j in range(i,0,-1): grid[j] = grid[j-1] grid[0]=[1,0,0,0,0,0,1] if removeLine: #Refresh the LED screen for i in range(0, 5): for j in range(0, 5): display.set_pixel(i,j,grid[j][i+1]) return removeLine gameOn=True score=0 showBrick() #Main Program Loop - iterates every 50ms while gameOn: sleep(50) frameCount+=1 #Capture user inputs if button_a.is_pressed() and button_b.is_pressed(): rotateBrick() elif button_a.is_pressed(): moveBrick(-1,0) elif button_b.is_pressed(): moveBrick(1,0) #Every 15 frames try to move the brick down if frameCount==15 and moveBrick(0,1) == False: frameCount=0 #The move was not possible, the brick stays in position grid[y][x]=max(brick[0][0],grid[y][x]) grid[y][x+1]=max(brick[0][1],grid[y][x+1]) grid[y+1][x]=max(brick[1][0],grid[y+1][x]) grid[y+1][x+1]=max(brick[1][1],grid[y+1][x+1]) if checkLines()==False and y==0: #The brick has reached the top of the grid - Game Over gameOn=False else: #select a new brick randomly x=3 y=0 brick = choice(bricks) showBrick() if frameCount==15: frameCount=0 #End of Game sleep(2000) display.scroll("Game Over: Score: " + str(score)) |
Note: When testing this code, you may want to remove some of the #annotations especially if your micro:bit returns a “memory full” error.
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