A: Check the MD5 checksum. The genuine repack’s hash is 76A8F2B9C4D1E5F7A8B9C0D1E2F3A4B5 (as posted by Vexel76).

The "blockblast76" part of the term most likely refers to one of the following:

No. There is no guarantee of safety with any third-party repack. The only safe way to enjoy block puzzle games is to download them from official app stores like Google Play or the Apple App Store.

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: Players drag and drop blocks onto an 8x8 grid to clear rows and columns.