Downhill Smash

The game idea itself is really good, the gameplay and upgrade system would have been really good. Sadly the ads really get in the way, but worse is the way that the gem currency is used. They're hard to get, but you need a lot of them to upgrade things past a certain point, and it totally walls your progress, unless you pay for them.

Another potentially great pay to win game. It gives you loads of coins to upgrade stuff everytime you don't finish the level but once you hit a certain amount of times upgraded on each part of the ball then you have to pay gems to be able to use coins again and you only start with about 5 gems and most of the upgrades cost more than 5 gems so almost theres no way to get further without buying more. There's also ads to continue from where you died, to double your won money. And then 30 second ad

A good game completely ruined by adverts and restricted play. I get that people make games to make money, but I've played this once and I'm never going to play it again. I put hours of my time and watched a lot more adverts on games like Archero where the ads aren't forced on you like this. And then it had that terrible mechanic where you only have so much energy (in this case keys) and it runs out so you can't keep playing. The gameplay itself is great, the monetisation is terrible.