Tetro Stack, inspired from Friedman’s Pentomino Puzzles. Put the five tetrominoes to the grid such that they don’t overlap or cover any circle. Gravity acts on these objects, so for each tetromino and circle, there is at least one square occupied by the tetromino/circle such that the square directly below it doesn’t exist (it’s on the bottommost row) or is also occupied by a tetromino. Medium?
Puzzle 23: Tetro Stack
I hope you understand my vague rules above 😛 Puzzle 24 to be posted within 10 hours.
Chaos at the Sky 
The ‘I’ and ‘O’ go uniquely, but L,N and T have many possible places to sit,if i got the rules correct.Either L or T can be placed in the bottom right. Then you have many options for the remaining two pieces in the centre of the grid. CAn you clarify the rules if you think the puzzle is correct?
I think the puzzle is correct, remember, “the square directly below it doesn’t exist (it’s on the bottommost row) or is also occupied by a tetromino”, so a circle below it doesn’t count
Yep. Circles are valuable, but useless. They must be supported by tetromino to avoid falling, but they themselves cannot support tetrominoes.
The rules are clear now.