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The "D S.E.R.I.E.S." is a collection of beginner to medium difficulty test chambers. "S.E.R.I.E.S" is the acronymm of :
Short, Extendable and Rapturous Introduction to Experimental Self-improvement.
If you want to relax in simple and fun maps, you're in the right place. New test chambers are added regularly so keep it in mind!
Again, if you're in search of tough puzzles, you will not enjoy the chambers of this collection. So please, don't rate them as bad because of a lack of difficulty. Some people just like enjoying simplicity, not solving hard puzzles!
At the end of the test process, this collection will have 999 chambers, from D001 to D999. Will you play them all?