Why do some Blackbox challenges have a border around them? - Arqade

On the home screen of Blackbox, most challenges appear as a box which is filled in with a solid color once completed. However, there are a few challenges which have an extra outline around them. W

Blackbox: Walkthrough Guide With All Puzzle Solutions – Page 2

Blackbox Puzzle 86 (Solved)

Blackbox: Walkthrough Guide With All Puzzle Solutions – AppUnwrapper

Blackbox: Walkthrough Guide With All Puzzle Solutions – Page 2

Der Riese/Boards, Call of Duty Wiki

Profile Page Makeover, Part 2: the Prototype - Meta Stack Exchange

Zone Completion - Ambermire - Full Area Coverage

Blackbox: Walkthrough Guide With All Puzzle Solutions – Page 2

graphics card - Black Screen when alt-tab or exiting fullscreen

Profile Page Makeover, Part 2: the Prototype - Meta Stack Exchange

Why do some Blackbox challenges have a border around them? - Arqade

The new yellow challenge seems suspect. : r/BlackboxPuzzles

Blackbox walkthrough part 3 challenges 11/15

Blackbox: Walkthrough Guide With All Puzzle Solutions – Page 2

Profile Page Makeover, Part 2: the Prototype - Meta Stack Exchange