Sure. You can add the submit button inside a group, and then add the condition: “show group if field equals Black”.
Example: https://conditional-fields-cf7.bdwm.be/form-tester/?hash=a1be22d245b8daa76e6da92bc244323b
Form:
Q: A Panda Bear is White & ... [text t].
[group s][submit][/group]
Conditions:
show [s] if [t] equals "black"
show [s] if [t] equals "Black"
Note that people will still be able to submit the form by pressing Enter though. This might be okay for a simple quiz or game, but if you can’t allow this, you will need to write some server side validation: https://contactform7.com/2015/03/28/custom-validation/. Or, you might be interested in using the quiz field, which is builtin to CF7: https://contactform7.com/quiz/
