How to play Alto

About Alto, from BoardGameGeek:

Level up your discs to score more points – but don't get too comfortable. The tiles guide your discs… but beware: once used, they flip and change direction. Use them a second time, and they're removed from the game – potentially disrupting your entire strategy. Who will outsmart the shifting board and find their way to victory? Each tile offers different ways to move your disc. Aim higher – the better the level, the more points you score. Beware: Each tile can only be used twice. After that, it disappears. Don't get stuck! Score 1 point for the first level, 2 points for the second, and so on. The player with the highest score wins. -description from the publisher