Set conditional formatting formula to change cell colors after conditions are met in a separate tab

I'm doing r/Fantasy's reading Bingo challenge this year, and thought I'd set up a spreadsheet to help me track my progress. The conditional formatting formulas have been causing me some trouble, though:

In Tab 1, I have the Bingo squares arranged in the usual 5x5 grid, and in Tab 2, I have all the squares & their reading rules, hard modes, and completion statuses laid out. I'd love to set it up so that if, in Tab 2, I mark "x square" as completed in "EASY" mode, then the equivalent "x square" cell in the 5x5 grid will automatically change color in Tab 1. Ideally the 5x5 grid won't need any manual color formatting, and I'll only need to edit Tab 2. But I haven't been able to figure out how to make this work across the two separate tabs.

In case I'm not describing it well, I'm including an editable Google Sheets version of the spreadsheet for reference: https://docs.google.com/spreadsheets/d/1S6EtJFLLSoysxIp-HHZT_tjVznucJuDbhqpDhbdPZX0/edit?usp=sharing

Thanks so much in advance!