Walk Master

there are ads every couple of minutes, though they only happen after you die or complete a level- never in the middle of one. you can also watch an ad to get coins and you have to watch an ad to unlock daily levels

the game appears to have infinitely generating levels

You can buy coins, but they are consistently earned in levels anyways, and they are only used to purchase accessories and characters (nothing gives you an advantage or makes the game easier). however, since you only earn 10 coins per level, some of the accessories can be a lot of work to earn for (the most expensive ones are 1000 coins, or 100 levels of playtime)

there is a challenge level that unlocks each day (i dont consider it a daily reward because you can play previous days' levels at any time, it does not force you to open the game each day to get the reward) but otherwise there are no timers

you unlock challenge levels by progressing in the game, and you unlock some characters depending on the number of challenges you complete (there are 17 challenges that unlock based on progress, and a seperate 35 that unlock based on days you've been playing it)

it urges you to complete every challenge to get medals and unlock characters, and also has characters, hats, accessories, and stilts that you can buy (with a little thing next to them that says how many you have, and how many total there are)

on the popup to buy coins, they put a 0.99 dollar for 500 coins, a 1.99 dollar for 1500 coins, and a 4.99 dollar for 5000 coins. the 1.99 obviously looks the most desireable, because it gives you 3x the coins as the 0.99 one, but for only twice the price.

when you win, the character you're currently playing as gets thrown up into the air by the other characters you've bought and theres confetti, and if you die or break your stilts, your character goes limp and looks shocked/distressed and dazed as stars circle around their head and the camera zooms in on them