If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
Group identical magic potions into chains of three or more to prevent them from filling the screen. Chain together three or more potions by placing them one by one onto the board. Chained potions will disappear and let the potions above fall down all the way through empty space. You can chain together potions side by side only, horizontally or vertically. You don't have to wait for a potion to fall all the way down to drop the next potions. Remember to act quickly, because potions will drop down on their own whenever their patience runs out.