Time to 100%: 0,01h; Difficulty: 0,01/10. Free to play, you just have to start the game.

Time to 100%: 25 minutes; Difficulty: 1/10. It's free to play and very easy to 100% in a short time.

Time to 100%: 15 minutes; Difficulty: 1/10. Easy going, free to play. Nothing to add, just do it.

Time to 100%: 1,5 hours; Difficulty: 2/10. Spending only 1€ to get 1 achievement in a little bit more than 1 hour.

Finally!

Time to 100%: 0,4 hours. Difficulty: 0,3/10. It's free to play. Use the excellent guide and finish this game.

Time to 100%: 0,4 hours. Difficulty: 0,5/10. Free to play, just find the auto-button to be as fast as possible. Easy doing.

Time to 100%: 1 hour. DIfficulty: 1/10. Free to play, it's a fun game and easy to 100%. Do it.

Time to 100%: 0,2 hours. Difficulty: 0,1/10. A monkey can do that. Such a stupid "game" - but very easy to 100%.

Time to 100%: 14 hours. Difficulty: 4/10. Easy and enjoyable!