Hoppers Jr. is a fun and challenging peg solitaire game designed for kids ages 5-7 to play on their own — although I’ve been having just as much fun with it as my kid testers! Once again, Thinkfun has done a great job with the design of this game (as with most of their games). The square sturdy board (along with a handy travel bag to carry the pieces and hook onto the board) is intended to mimic a lily pad pond, and the object is to have the chunky little frogs hop over each other until only the red frog remains. The green frogs can hop over each other in any direction, and the 1 red frog can also hop over the greens, but the greens can not hop over the red. Like many of Thinkfun’s games, Hoppers Jr. comes with a Challenge Book with game board setups ranging from Easy to Super Hard. Some of the challenges actually start getting “challenging” in the medium range, so somewhere along the way your grandchild will likely require some friendly encouragement and assistance. At the more difficult levels it will be necessary to navigate the board more than once, possibly many times, in order to crack it. Similar to Chess, it helps to study the board and try to see all of the remaining moves, or hops, ahead of time. However, there is only one player so there are no surprises — just good mind-stretching fun! Thinkfun also sells a version of this game for older children (ages 8-12).