Hopscotch, under the most common rules, can be played solo or with a group of any number of people you like. When playing in a group, determine a player order before you begin playing and stick with it throughout the game to be fair.
Basic game play involves tossing an object and hopping. The first player up throws their marker into the first square. That player then hops over the square with the marker, landing on one foot in the next available empty square. That player continues hopping -- and balancing -- on just one foot per square, following the order of the squares on the court. Hop on the same foot throughout each turn, and just one hop per square, please, with two exceptions: Some court designs include side-by-side squares, where a player jumps with one foot in each square during that hop (as long as there is no marker in the square), and some include rest squares, where a player may put both feet on the ground.
Reaching the end of the court, the player turns around -- still balancing on one foot -- and hops in return through each square of the court. On the way back, the player must pick up the marker and hop over that square without losing balance.
After each successful turn you advance to the next square. For example, once you successfully complete your first turn with your marker in square one, during your next turn you'll toss your marker into square two -- and so on until you've successfully completed a turn for each sequential square on the court. The winner is the first to successfully hop every number in order.
Your turn is over if you lose your balance, hop on a line, or touch a line with a hand. Your turn is also over if your marker toss misses the designated square or lands on a line.