For example you want to make the grid 6x6 that equal to 36 piece, you need to make change to some values in event sheet. The example has 5x5 grid that makes 25 in total. Change everything in event with value of 5 with 6 and value of 25 with 36. Another thing to consider is spawning point. Previously the spawning point was 256 for it's Y position, so we need to put it 'higher' with lower value for example 100. Change everything with value of 256 with 100.
To sum it up, modify the values at event 27, 28, 29, 31, & 32