press keyboard number key or operator key to make tile.
drag tile to tile for making one.
"x" button for delete tile "▶"button for making calculate tile "▩"button for unpacking tile for each one "□□"button for duplicate tile
can use abs, sqrt, f(x), sin, pi, log !!
ex) 1.make "f(x)=x+x" tile. 2.click "▶"button 3.make "f(3)" 4.click "▶"button