Reduced difficulty in several levels of world 7 : [list] [*] 7-7 -> Reduced speed & max velocity of directional boxes. [*] 7-8 -> Reduced number of steps by 1 and moves some platforms a bit. [*] 7-10 -> Added a 'checkpoint' on the middle of the level. [*] 7-12 -> Tweaked mass & velocity of boxes. [/list]