You can get multiple "unique" items by selecting another weapon to place and clicking on the item. Note: you can only attach weapons to the last block you place and the multiple portals may mess with the physics of the game eg. sideways gravity.
You can get the hard badge without getting par on all of them. You just have to do more extra stars by getting below par. You can get more than one extra star if you do much better than par. My best is 3 under par. Hint: you can usually destroy wood blocks with one hit if you ricochet it back and you can destroy multiples by hitting the seams
The sticks rotate at a speed equal to their values multiplied by 24 degrees per second. It then draws a line connecting the points every 24th of a second such that the angle between the two points from the center of rotation is equal to the value of the stick. Numbers between 180 and 360 give the illusion of being negative when they are in fact spinning so quickly that it renders on the other side appearing to go in the opposite direction. Every 360 the apparent speed is equivalent to 0 causing all numbers greater than 360 useless. You can draw everything with the numbers 0-360 by subtracting 360 as needed 977=617=257. The letters have values equal to their position in the alphabet a=1 b=2... z=26. By placing the letters in sequence it is the same as writing a number with letters instead of numbers. aa=11 ab=12. Letters with values greater than 9 add the first digit of their value to the previous value. Ex ka=111 fy=85 zz= 286.