Peg Solitaire - Screenshot

The option to show the winning moves is turned on, so the pegs glow to show which ones to move:

• Pegs glowing yellow can be moved to reach the winning position.
  The mouse has been moved over the center peg in this screenshot, so the possible holes to which it can be moved are also glowing. The hole that is glowing green is a move that leads to the winning position. However, moving the peg to the hole glowing blue will mean the winning position can no longer be reached.
• Pegs glowing purple can be moved, but if any of these are moved the winning position will not be reachable.
• Pegs not glowing cannot be moved.