You get 3 pieces each turn to put into the grid. Click and drag with the mouse into the grid. make full rows or columns to make them disappear. you can't rotate the blocks.
Play with the mouse was a challenge to make but I think it makes a better game than the arrow keys. I used lists to track the 10 X 10 grid and pieces. This was difficult to do because scratch does not have arrays. When it came to the last part of checking if there at are any moves left I used if touching colour as it was just easier to do. Each piece has an equal chance of being selected. I think that in the actual 1010 game it is not totally random and some pieces come up more often than others. This is the 4th game I have made in scratch and I would not have been able to make it if I had not made each of the previous games. This game would have been simpler to make using if touching colour and I would do it that way if starting over. But I learnt a lot about lists and strings in making this project. I hope you like it and it. Thanks for viewing. If you have any questions check out the scratch wiki: https://wiki.scratch.mit.edu/wiki/Scratch_Wiki_Home