First Playthrough

Things I learned after finishing the first Time Quest: ① The free coin ad on the bottom left of the SHOP on the home screen is limited to 4 times (50 coins x 4 = 200 coins) ② Watching ads on the roulette on the right side of the home screen is limited to 5 times at once. ③ When watching the pop-up ads for about 10 seconds during gameplay, you get a random amount of 100, 120, or 150 coins. ④ The "level" in the hidden quest refers to the "puzzle" within the game map. I've just started, so there might be other things, but I don't know how far I need to progress until the difficulty requires me to use items. So, I'm planning to stock up on items and coins by watching ads as much as possible in the early stages (｢`･ω･)｢ From what I've seen in the community, it seems like up to hidden quest level 10 is quite tough (• ▽ •;)