I used to love this game but it has become tediously frustrating. There are too few opportunities to win bonuses or tools so you end up having to tackle really hard levels without extra help. And even if you have tools available, you end up wasting them because it's rarely down to skill. You have to play repeatedly, for weeks on end, until it decides to give you a winning board. Until then, there's nothing you can do to complete some levels. Needs more skill / less chance, and more bonus tools.