[CORE] difficulty merge

THIS GAME DOES NOT SAVE YET! UPDATE1.5: ++ Core: Click the core to gain a cash multiplier + Fixed a major bug where the cash upgrade's price won't go up + Fixed Prestiges + Bug Fixes difficulty merge is a game where you merge cubed difficulties. team up to get as far as you can or solo in a private server. unlock many reset layers that give you boosts and multipliers. will you prevail?