The game is almost complete randomized every time that you play it, except for level 0, so right from the beginning you will be able to get a good look at a wide range of the challenges. The easier ones tend to get saved for the earlier levels, though, and the harder ones tend to pop up a bit more often as you get into the later levels. If you are playing with a data connection, then an ad will pop up in between every round that you play. If you are playing without a data connection, or with a really bad phone signal, then an ad will not pop up, but the game will freeze for the same amount of time that it would normally take for the ad to play, totaling out to about 10 or 15 seconds each time. So if the game seems like it's frozen, give it a little bit of time and it will begin playing again. If you have a good data connection, also, then after every round you will be given the option to start over again from where you left off when you died. To do this, you have to watch a full 30-second ad video. Considering how long of a time it takes for your ordinary ad to play without a bonus, it's worth it to take the bonus so that you can earn the highest possible score and make it to the next challenge. Obstacles should never be knocked straight up unless you're either coming right to the end of the current level, or unless there is literally no othero option. If they go flying upward, they can jostle other off-screen objects below them, causing more chaos than you otherwise would have to deal with. There are currently 40 levels in this game, which is about 38 more levels than most people can beat. Currently, if you beat all 40 of them somehow, you beat the game, but the developers can be expected to add even more levels to the game as they push out new updates, so keep an eye out in the App Store or in the Google Play store for more updates to add more levels to the game.