St. Louis-based Android software developer Tesseract Mobile has added a Challenge feature to its Solitaire Free Pack and Solitaire MegaPack apps for Android.

“The idea came from a customer request,” Laura Ockel, co-founder of Tesseract Mobile said. “And that sounded really awesome to me. Imagine being able to share that winnable hand of Aces Up or Alternations!”

The challenge button lets players share their favourite hands and compare scores.