(Print) Use this randomly generated list as your call list when playing the game. There is no need to say the BINGO column name. Place some kind of mark (like an X, a checkmark, a dot, tally mark, etc) on each cell as you announce it, to keep track. You can also cut out each item, place them in a bag and pull words from the bag.
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Gigantic Flow instead of multiple Subflows
Exactly 75% test coverage
Unjustified big number of Record Flows on one sObject
Calling Queueable in loop without control mechanism or logging
SOQL without WHERE or LIMIT outside Batch
Public Read/Write OWDs
Excessive amount of System.Debug()
SOQLs in loop
DMLs in loop
Multiple triggers on one sObject
Hard-coding UI text instead of Custom Labels
Hard-coded authentication instead of using Named Credentail
Method with 100s 'i++' lines for fake code coverage