An update for Minecraft
Minecraft: Redstone Update adds several new redstone-related blocks, including the comparator, hopper, dropper, daylight sensor, trapped chest, weighted pressure plates, and block of redstone, as well as a new block called block of quartz, a scoreboard system, a new texture pack format, and a lighting engine optimization.
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I could not for the life of me tell you what a comparator even does but I sure like hoppers and quartz.
This was a solid update, needless to say changing and vastly improving Redstone contraptions forever.