Pick anything and be asked it cold, whether or not you owe it. Nothing here is unlocked by anything else.
Chapter 1
1.d4 Nf6 2.c4 e6 3.g3 d5
200 decisions · 40 rounds of 5
Black plays 4...Be7
86 decisions · 18 rounds of 5
Black plays 4...Bb4+
23 decisions · 5 rounds of 5
Black plays 4...dxc4
103 decisions · 21 rounds of 5
Black plays 4...c6
42 decisions · 9 rounds of 5
Black plays 4...c5
10 decisions · 2 rounds of 5
Chapter 2
1.d4 Nf6 2.c4 e6 3.g3 Bb4+
90 decisions · 18 rounds of 5
41 decisions · 9 rounds of 5
Black plays 4...Qe7
21 decisions · 5 rounds of 5
Black plays 4...a5
25 decisions · 5 rounds of 5
5 decisions · 1 round of 5
Black plays 4...Bxd2+
2 decisions · 1 round of 5
Chapter 3
1.d4 Nf6 2.c4 e6 3.g3 c5
31 decisions · 7 rounds of 5
Black plays 4...exd5
27 decisions · 6 rounds of 5
Black plays 4...d6
22 decisions · 5 rounds of 5
Black plays 4...b5
1 decision · 1 round of 5