It is currently not possible to create several groups consisting of 2 blocks each, where the second block only appears when the first block of each group has satisfied a certain criteria (ie score below X), and then having these groups be shuffled via stages.
The reason this is not possible is because you need to define in the jump logic that either the user satisfies the criteria and needs to jump to the second block in the group, or he doesn’t satisfy the criteria and needs to jump to the first block of the next group. The latter can only be done by defining which exact block the user jumps to. This breaks the random feature.
The feature that is missing is to define a “next group”, “next stage” or similar so that the flow can be defined independently of the exact order of the groups/blocks.