no, when it's rolled up it's legs are inside the ball so it needs to unroll to move about
The heart rate is 2-48 bpm, I believe.
Yes, this is what you normally do since you can't place them in face down attack position.
A monster in face-down Attack position is unable to declare attacks. It can be flipped or Flip Summoned, both actions will switch it into face-up Attack position. It can also have its battle position change by the controlling player, switching it from face-down Attack position to face-down Defence position.
Unless there is a card effect preventing it, it can attack.
Hedgehogs have two responses; the most usual for them is to curl up in a ball and wait the predator out, as they can't eat a hedgie when it's rolled up. The second is to run; they're surprisingly fast!
There are occasions where the game will muck up, the camera will switch to a bad position, your attacks wont do anything and just falling through the level are examples of some glitches in Shadow the Hedgehog.
Only the Spell card Darkness Approaches can flip a monster into face-down Attack position. By discarding two cards, Darkness Approaches lets you flip one face-up monster face-down without changing the battle position (so a monster may end up in face-down Attack position).
The core rules state that a Normal Summon places the monster in face-up Attack position, and a Set places it in face-down Defense position. Special Summons are face-up Attack or Defense position, unless stated otherwise. If the continuous Trap card 'Light of Intervention' is active, monsters can be Normal Summoned in face-up Defense position.
rolled up is an adjective so You could possibly say The purple sheet was rolled up tightly
yes.
Maria is simply a made up hedgehog and if you have ever herd of sonic the hedgehog maria is one of our hedgehog heros.
A face-down monster can only be Normal Summoned in face-up ATK position.