By writing 3D objects in Python, you can create simple games.

Unity3D tutorial "Roll-a-ball" can be described in Python as follows.

Create walls

Camera.Reset()

Player.Reset()

Player.Rotate(0, 180, 0)

Objects.Clear()

Objects[100].Type = 'cube'

Objects[100].Position = (0.5, 0.5, 9.5)

Objects[100].Scale = (19, 1, 1)

Objects[100].RGBA = (240, 176, 176, 255)

Objects[101].Copy(Objects[100])

Objects[101].Position = (-0.5, 0.5, -9.5)

Objects[102].Copy(Objects[100])

Objects[102].Position = (-9.5, 0.5, 0.5)

Objects[102].Rotation = (0, 90, 0)

Objects[103].Copy(Objects[102])

Objects[103].Position = (9.5, 0.5, -0.5)

Tracking player

Camera.Target = Player

Add Item objects

n = 6

for i in range(n):

    t = i * (360 / n)

    rad = math.pi * (t / 180.0)

    x = math.cos(rad)

    z = math.sin(rad)

    #print t, x, z

    Objects[200 + i].Type = 'capsule'

    UpdateScore()

    Objects[200 + i].Color = 0x00ff00ff

    Objects[200 + i].Position = (x * 5, 1, z * 5)

    Objects[200 + i].Scale = (0.5, 0.5, 0.5)

    Objects[200 + i].IsTrigger = True

    Objects[200 + i].RaiseEvents = True

Delete Item when touching

def triggerEnter(sender, hit):

    print 'triggerEnter', sender, hit

    if hit != Player:

        return

    Particles[1].Type = 6

    Particles[1].Position = sender.Position

    sender.Type = None

    UpdateScore()

Label display

def UpdateScore():

    score = len([1 for x in Objects.All if x.Index / 100 == 2])

    if score == 0:

        Items[2].Text = 'YOU WIN'

    else:

        Items[2].Text = str(score)

Create dangerous walls

Objects[300].Type = 'cube'

Objects[300].Color = 0xff0000ff

Objects[300].Position = (4, 0.5, 2)

Objects[300].Scale = (10, 1, 1)

Objects[300].RaiseEvents = True

Objects[301].Copy(Objects[300])

Objects[301].Position = (4, 0.5, -3)

Objects[302].Copy(Objects[300])

Objects[302].Position = (-4, 0.5, 4)

Objects[302].Rotation = (0, 90, 0)

Collision determination

def collisionEnter(sender, hit):

    print 'collisionEnter', sender, hit

    if hit != Player:

        return

    Player.IsControlled = False

    Player.ChangeFace('eye_close')

    Player.CrossFade('GoDown')