I has a few Mario Mode suggestions. (Please note, i haven't read the previous pages. Only Page 1 Post 1.)
When you start Mario Mode, you're somewhat small (undecided scale) with 100% scale abilities. When you are hit, you instantly die. (See ShufflaRB2) (This will be referred to as Mini Sonic) (Note: No Special Ability, and no Spindash!)
~ITEMS~
Mushroom - Grow to normal size. Being hit turns you into Mini Sonic. If the item is hit via a block, it will move right in 2d mode, and a random direction in 3d. It will bounce off walls like the Koopa Shell.
Fire Flower - Turn white, grow to normal size. Being hit turns you to Sonic. (Mushroom).
Mini Mushroom - Go extremely tiny and fit through tiny holes! Being hit will kill you. You cannot defeat enemies. If the item is hit via a block, it will move like the Mushroom.
Mega Mushroom - Go extremely big and stomp through anything! Bricks and Enemies will break/die on touch, like invincibility. Limited time. Cannot be hit. If the item is hit via a block, it will run away from the player.
Star - Turn invincible on touch. Works like the Invincibility, except your person turns disco colour. If on the screen, it will bounce around to the right, except in 3D mode, where it will bounce around in a random direction. Bounces off walls like a Koopa Shell. Cannot be hit.
Spiky Mushroom - Grow to normal size and get the ability to Spindash. Being hit turns you to Mini Sonic. (Perhaps has limited time?)
Lakitu Cloud - Can only be gotten by using Fire on a Lakitu. Riding the cloud will enable you to move very slowly, but fly. You will slowly descend, but you can press Jump to go up (And UP in 2d mode). Being hit will hurt you to what ability you have and make the cloud dissapear.
~ENEMIES~
Goomba - Classic goomba. Does not follow the player, but walks in a random direction, and changes direction if there's a cliff or wall.
Koopa - Faster than Goomba movement. Spawns Koopa Shell on defeat.
Shy Guy - Crawla movement. Hit like normal enemies
Lakitu - Flies around dropping Spinys onto the player. Dosen't change vertical axis. Follows player. Hit like normal enemies.
Spiny - Walks around like a Goomba. Can only be hit with Fire or Invulnerability.
Boo - Follows the player like a Buzz. Will stop and become invulnerable if the player looks within 90 degrees of it.
Yeah. :P I just wanted to say that Mario Mode isn't really Mario-y right now. :P I'm not saying that you should add these on the official Mario Koopa Blast levels, but it would be nice to add them anyway.