Speed Coins – run across one and you get a speed boost for 10 seconds.
Shields – run across one and you are immune from fireballs for 10 seconds.
Uniforms – When entering Linden Realms a uniform will automatically attach, detaching all scripted items from your avatar. “Runners” would be able to choose colors and/or other personalization options.
Levels – A Runner must acquire X number of Red crystals before any Yellow Crystals can be gathered. A Runner must acquire X number of Yellow crystals before any Orange Crystals can be gathered. A Runner must acquire X number of Orange crystals before any Green Crystals can be gathered. The HUD can keep track of this.
Challenges – Once the initial challenges are completed, the game gets dull. Introduce more challenges.