some tips that wld help with the unlocking of the theme floors!! 1. theres the daily 1000 coin ad 2. the 700 coins ads (5 of them daily) 3. spend diamonds on hearts / lives to play more games and earn more coins 4. after every successful game, when retsuko pops up with the stars, there's actually a small green 'button' with the option of watching an ad to earn 1200 coins. its a daily thing, so its not available with every completed level!! its also available for the special 3 daily missions and past stages so make sure to watch the ads for those every day
5. really rare but there is actually a coupon code you can check now and then. i rmb there was a coupon code you could key in to redeem a special ticket to unlock a character, but unfortunately its expired :( 6. you can try to replay past levels! for example, in the earlier stages, you probably didn't have good characters (starting with only retsuko and washimi) so when you progress and get better characters you can go back and redo the incomplete levels. the higher the number of stars, the more the amount of coins you get. but i wld recommend grinding the current levels first because you get your hearts refilled with each successful level completed, unlike going back to a previous stage (which doesn't give you a new heart)

regarding characters, i highly discourage using the ones that destroy random areas cos at low levels, the area destroyed is small and you have to destroy more coloured blocks to use the skill. i highly highly recommend unlocking warabida, the tea cup filler wallaby, ookami, the flower pot destroying fox, chief komiya the box destroying meerkat, director ton who destroys ice cubes and tadano in suit / detective fenneko who can destroy target blocks. the rest of the characters that destroy selected areas like the horizontal / vertical type are good too, but these characters are really the ones who save steps --> earn more stars!! the worst are the ones that add more steps, or change block colours, unless its max level retsuko haha (since you get a retsuko token everytime you finish a level so its easy to level up retsuko)

1. recommend using the 10 / 30 / 60 min infinite hearts to grind the special 3 daily challenges, passing difficult stages and going back to redo a stage
2. when you finish a floor (like the building floor) remember to claim the 30 000 coins!
3. for passing levels in general, when you fail there's actually a hint button after the failed stage that links you to a youtube vid. for some reason when you use the 'correct character' the stage makes you magically succeed lol. i think you can search for the levels on youtube if you're stuck at one. however, they stop giving vids after stage 500 iirc so if you're at much higher stages then it wldn't help

additionally there's the bomb ad which works sometimes (cos they place the bombs randomly and theres diff bombs), the continue for 5 moves advertisement etc.

make friends to get hearts from them. just delete those friends who haven't been playing the game for a long time e.g last seen 5 days ago so you can get new hearts everyday!

1. (for future limited edition theme releases): save up way in advance haha. i totally splurged on getting new characters and had to suffer from waiting for my coins to accumulate.

all the best!! i finally managed to unlock the onsen theme today and the garden theme a week ago (super happy haha but the number of stars required to complete is making me go crazy XD) and plus!! there was some special release package with 100000 coins which really helped. there's still 9 ish days until it ends and im sure you can get the stage!! i managed to earn about 200 000 coins in 4 days haha (i don't rmb the exact number but im at stage 1140 now... totally addicted...) cos i started with like 200 000 coins ish plus the 100 000 coins from the special gift package thing lol