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A permanent record of every observed change.
Playing now
0−1 vs. yesterday
All-time peak
412 Sep 2026
A permanent record of every observed change.
| Status | Key | Previous value | New value |
|---|---|---|---|
| Added | ACH_1 | — | print ("Hello, world!") — Complete 1st Chapter |
| Added | ACH_10 | — | var v = [1, 2, 3] — Complete 10th Chapter |
| Added | ACH_100 | — | 100% — Complete All Chapters |
| Added | ACH_11 | — | var m = [[1, 2], [3, 4]] — Complete 11th Chapter |
| Added | ACH_12 | — | extra — Complete 12th Chapter |
| Added | ACH_13 | — | impossible — Complete 13th Chapter |
| Added | ACH_2 | — | def f () { } — Complete 2nd Chapter |
| Added | ACH_3 | — | return — Complete 3rd Chapter |
| Added | ACH_4 | — | get_int () — Complete 4th Chapter |
| Added | ACH_5 | — | if (true) { } — Complete 5th Chapter |
| Added | ACH_6 | — | while (true) { } — Complete 6th Chapter |
| Added | ACH_7 | — | for (var i = 0; i < n; ++i) { } — Complete 7th Chapter |