Our previous work, FIBER (Flipped Issue-Based Enquiry Ride), is a pedagogical framework to integrate FC (Flipped Classroom) into the process of issue-based enquiry learning for social humanities education. This paper presents our recent work, G-FIBER (Gamified-FIBER), in which we have re-worked on FIBER with the infusion of gamified learning. In the evaluative study (with 72 high-school students in Hong Kong), we showed the pedagogical effectiveness of G-FIBER was significantly higher than FIBER's, with a medium-to-large effect size. This re-work contributes to the field with evidence for grounding more future studies on the crossover between FC and gamified learning for advancing students' learning in school education. Copyright © 2021 by The Institute of Electrical and Electronics Engineers, Inc. All rights reserved.