Please both track the % defense and post the top 100 best defenders. You may or may not want to enable peeps to visit them from this list. Could keep it interesting to reveal only upon a random visit... and on visit, should be a significant notification alla, "Top 100 Defender!" Additionally, allow players to vote on a great defense, or innovative, fun way of laying out a map. So if I visit someone and really like what they've done, haven't seen it before, or lol, I can "like" their map. Should have a list of the top 100 most "liked" maps that we can visit, certainly. Feel as if could continue ideating forever because you've created fundamentally a solid game to which to contribute ideas, your story can support them (even if your servers can't – see Maintenance). Here's one more: Your top players will automagically be your greatest level designers. Use these top defenders and innovators as identified by other players and also just stats, to construct a single-player version of the game. Allow peeps to sandbox in the single-player version, which would enable off-line game play, not have an impact on online game play except in some immaterial ways (like perhaps they can win some decorations, or fancy icons/titles).