Board Thread:General Discussion/@comment-109.156.98.100-20170316181007/@comment-30638141-20170318050358

The last stage requires 100 visits at 25 access keys each. It is doable without buying if you regenerate energy alot. You will finish all collections by about the 50th visit +/- 10 visits. That is usually worth doing if you can. The final bit gets you the useless but desirable avatar picture you would use only until the next time you finish a challenge.