1. limit special panels to 4 on the board at a time, so it always takes a cascade to clear/activate them (drawback: lose the satisfaction/strategy of double impact)
2. instead of or in addition to having special panels, do "charged" normal panels that do an extra effect when cleared
3. increase the value of triple+ combos?
4. highlight panels with 5 or more on the board, either normally, when low on time, or with a status
5: "blind" status that hides your cursor
6: Jumpy status, cursor moves 2 at a time
7: increase value of chain-activated attacks