Good ! A shame you didn't reached 700, your stack was really low at 652. Some (a lot of) comments: Level 303 When you're building, you should really really think "What piece can I place in that hole ?" and place it immediately when it is distributed. In that case, there's only the J and I piece that can fill that hole. J is IMO the best piece to place and you didn't it. Level 332 I think it's possible (with DAS) to place that Z to the right, which is a much better position than the other one. Level 375 There's something I learned from TDS wifi, and that is that non-overstacking construction (caffein would say "look below") often makes the difference between life and death. I would have placed the to the right, because this line is the first obstacle that prevents you from cleaning your stack. Notice that you did just fine, but that might be of some use in 20G. Level 402 Hum. There's a non obvious at all but still very useful wallkick with the L piece. That you could have used. General case (+ the same in slow motion + the same with its mechanisms) It works with J too, as you could do at 597 Level 590 You should have IRS-ed that L.