Black Sheep Dream is a Super Mario Bros 2 RomHack developed by Aether Knight released in 2020. All 20 worlds have been changed to accommodate the “B” run. I’ve always felt the original SMB2USA was a bit on the easy side since you can “B” dash through most of the game with little consequence. Now most of the levels require use of the “B” run. For instance, sometimes you’ll need to drop off of a ladder/chain/vine from the top and you’ll miss the platform if you don’t hold down “B” as you’re letting go. You may also need to super jump and hold down “B” to reach certain platforms.