Recommended

App is disappointing, don't bother, save your money. For a computer mag app this is nothing more than PDFs. very poor!

Great game, curiously addictive

Very addictive, good game and graphics

Another example of an "improvement" which makes things worse. Ok if you are a rocket scientist, I previously used landscape when I wanted to calculate a trajectory to Mars. For most of the time I used it in portrait mode for simple calculations .. Pity less is more!