$ cat cards/radja-nainggolan-521-2018/faq/completion-faq-21.md
Is Radja Nainggolan 521 required to complete the Panini virtual album?
card: Radja Nainggolan 521 (2018) · category: completion
[Concise Summary]
Yes, Radja Nainggolan under code 521 is required for basic album completion. The checklist defines 685 core stickers that must be collected to claim the final completion badge.
[Structured Data Grid]
| Album Slot Required | Yes |
| Total Checklist Size | 685 slots |
| Completion Threshold | 100% core set |
| Companion Status | Verified active checklist |
Detailed Investigation & Analysis
Basic completion rules require filling every numbered slot in the standard pages. Missing items prevent the final digital badge from unlocking. Since Radja Nainggolan is required, check your binder checklist to verify slot status.
Additional notes for collectors: Ensure checklist entries are verified before confirming trades. Standard trade ratios are calculated relative to card popularity.
[Album Context Specs]
| Card Code | 521 |
| Official Name | Radja Nainggolan 521 (2018) |
| Estimated Value | $0.86 USD |
| Album Section | Belgium (2018) |
| Completion Mode | Required Checklist Item |