Thanks for the help everybody, but it still doesn't work. I've tried these functions as collided values (as Jeffrey Kleykamp suggested):
pygame.sprite.collide_rect() takes only sprites as values and then uses their rects. That means I can't use the sprite's scaled "hitbox" attribute, otherwise I get this error: AttributeError: 'pygame.Rect' object has no attribute 'rect' And if I do sprite.rect = sprite.hitbox, the image gets blitted at the top left corner again. pygame.Rect.colliderect() doesn't work. pygame.sprite.collide_rect_ratio() works as intended but causes a huge performance drop, so it's not useable for me. I have quite a lot of sprites on the screen (sometimes over 100). Christopher Night is right. It would be a lot easier for me, if Pygame sprites had an additional (optional) hitbox rect. Maybe I should rewrite my collision detection passage and just use pygame.Rect.colliderect() instead of pygame.sprite.spritecollide(). -- View this message in context: http://pygame-users.25799.x6.nabble.com/pygame-Scaling-the-hitbox-rect-of-a-sprite-tp1227p1237.html Sent from the pygame-users mailing list archive at Nabble.com.