(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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Excessive lack of .startTest() and .stopTest()
Unjustified big number of Record Flows on one sObject
Hard-coding UI text instead of Custom Labels
No checking collection emptiness before DML
DMLs in loop
Gigantic Flow instead of multiple Subflows
No Fault Paths in Flows
SOQLs in loop
Getting IDs by loop instead of Map(records)
Multiple triggers on one sObject
Method with 100s 'i++' lines for fake code coverage
Only catching general catch(Exception)
No Test data factory/builder
Code in trigger instead of Trigger Handler
Hard-coded ID
No assertions in Tests
Excessive amount of System.Debug()
No flags to deactivate trigger declaratively
Nondescriptive variable names in Flow
Hard-coded authentication instead of using Named Credentail
Calling Queueable in loop without control mechanism or logging