Watch out for object placement. Some people like to set up a wall of object tokens to block or inhibit Green Scars Smash power. Green Scar can't move through hindering when using his smash power. You could go with Swingline or just don't pick up an object until you reach this wall.

so what about unstoppable can you use unstoppable to afold hindering?

Unstoppable would allow 'Scar' to ignore hindering for movement purposes, but keep in mind, it would only work on clicks where he has Super Strength showing.

His SP is a power action, but it states that movement occurs. Unstoppable does not state that a move action needs to occur, just movement, so it would work with his SP.

UNSTOPPABLE (5 points)
PREREQUISITE: Super Strength

Choose a character.

The character treats hindering terrain features as clear terrain for movement purposes. Once when given a move action, if the character is adjacent to a blocking terrain feature, it may make a close combat attack as a free action targeting that feature. The character may move both before and after making this attack.

So as long as the character qualifies for the feat (IE has Super Strength) then yes, you can use Unstoppable.

Okay but can go untaoppable thought a wall then smash someone on the other side? I say no.

Sure can't. The blocking/wall-attacking part of Unstoppable only works with move actions. Smash is a power action and it doesn't grant a move action during that power action.

Correct.
As a side note, Rampaging Hulk's Squash power is a move action, so it's fully legal for him to crash through a wall before making the attack.