Since this game is out today, and I'm off work cuz of the snow in the midwest, let's get some friendly helpin' going on in this here forum. We can list/ask where powerups and yashichis are. 
 
Also, please use spoiler tags.
 
I can't find the hacking tool, electric arm. I think I need it to defeat the megacopter but it's no where in sight.
 
edit: nevermind, megacopter defeated

I'm stuck on Monte Blanco.  You get to the part with the helicopter and it tells me to scan the environment but I cant see anything. 
 
The speed boost power up is the  SPOILER WARNING: Click here to reveal hidden content.

took me about 10 minutes

Sorry this is little offtopic but any idea how long is the game anyways? I'm thinking of buying it, because i liked Rearmed 1 a lot.

so far it seems to be comparable to rearmed 1's length

Challenge Room 11, sadistic.
 
edit: oh i just figured it out! think ninja gaiden.
 
edit2: oh, and there it is, all of them.  
 
just ask me if you need help with any rooms.

Sacichis are getting tough to find. Found the first four easily but none since, and I am on the temple now. It's pumped with hidden stuff which I really like, such as the automatic drones which are really making combat easy.

The temple one becomes obvious upon replaying, but it's kind of a bitch to get.

Forgot to add: main game is great but challenge rooms and their leaderboards feel slapped together. No restart button really stinks.

Yeah I'm disappointed with the challenge room mechanics. You have you watch the numbers scroll for like 10 seconds every time you complete a level, so if you're trying to shave off tenths of a second, it gets really annoying. Also you can't see your times unless you go to the leaderboards, or your previous star ranking EVER.

im stuck on the final boss D:

Also does anyone know how to get the yashichi on monte blanco?