IWBTG trolls you hard the entire time. Double jumps that don't always work? Check. Blocks that don't appear until you land or hit them? Check. A path that ends in a dead end that can only be resolved by death? Check. Impossible jumps and spikes everywhere? Check. Patterns and other things you have to do perfectly or die horrible? Check.
SMB isn't near as bad until the later levels, and don't get me started on the nightmare versions of all the levels.
SMB isn't near as bad until the later levels, and don't get me started on the nightmare versions of all the levels.