Created Snake, classic arcade game.

Cannon Shoot/cannon.py

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+from random import randrange
+from turtle import *
+from freegames import vector
+
+ball = vector(-200, -200)
+speed = vector(0, 0)
+targets = []
+
+def tap(x, y):
+    "Respond to screen tap."
+    if not inside(ball):
+        ball.x = -199
+        ball.y = -199
+        speed.x = (x + 200) / 25
+        speed.y = (y + 200) / 25
+
+def inside(xy):
+    "Return True if xy within screen."
+    return -200 < xy.x < 200 and -200 < xy.y < 200
+
+def draw():
+    "Draw ball and targets."
+    clear()
+
+    for target in targets:
+        goto(target.x, target.y)
+        dot(20, 'blue')
+
+    if inside(ball):
+        goto(ball.x, ball.y)
+        dot(6, 'red')
+
+    update()
+
+def move():
+    "Move ball and targets."
+    if randrange(40) == 0:
+        y = randrange(-150, 150)
+        target = vector(200, y)
+        targets.append(target)
+
+    for target in targets:
+        target.x -= 0.5
+
+    if inside(ball):
+        speed.y -= 0.35
+        ball.move(speed)
+
+    dupe = targets.copy()
+    targets.clear()
+
+    for target in dupe:
+        if abs(target - ball) > 13:
+            targets.append(target)
+
+    draw()
+
+    for target in targets:
+        if not inside(target):
+            return
+
+    ontimer(move, 50)
+
+setup(420, 420, 370, 0)
+hideturtle()
+up()
+tracer(False)
+onscreenclick(tap)
+move()
+done()

Snake Game/snake.py

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+"""Snake, classic arcade game."""
+
+from turtle import *
+from random import randrange
+from freegames import square, vector
+
+food = vector(0, 0)
+snake = [vector(10, 0)]
+aim = vector(0, -10)
+
+def change(x, y):
+    "Change snake direction."
+    aim.x = x
+    aim.y = y
+
+def inside(head):
+    "Return True if head inside boundaries."
+    return -200 < head.x < 190 and -200 < head.y < 190
+
+def move():
+    "Move snake forward one segment."
+    head = snake[-1].copy()
+    head.move(aim)
+
+    if not inside(head) or head in snake:
+        square(head.x, head.y, 9, 'red')
+        update()
+        return
+
+    snake.append(head)
+
+    if head == food:
+        print('Snake:', len(snake))
+        food.x = randrange(-15, 15) * 10
+        food.y = randrange(-15, 15) * 10
+    else:
+        snake.pop(0)
+
+    clear()
+
+    for body in snake:
+        square(body.x, body.y, 9, 'black')
+
+    square(food.x, food.y, 9, 'green')
+    update()
+    ontimer(move, 100)
+
+setup(420, 420, 370, 0)
+hideturtle()
+tracer(False)
+listen()
+onkey(lambda: change(10, 0), 'Right')
+onkey(lambda: change(-10, 0), 'Left')
+onkey(lambda: change(0, 10), 'Up')
+onkey(lambda: change(0, -10), 'Down')
+move()
+done()