(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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Only catching general catch(Exception)
Hard-coded ID
SOQLs in loop
Public Read/Write OWDs
Code in trigger instead of Trigger Handler
Exactly 75% test coverage
Excessive amount of System.Debug()
No assertions in Tests
DMLs in loop
Gigantic Flow instead of multiple Subflows
Nondescriptive variable names in Flow
Method with 100s 'i++' lines for fake code coverage
Unjustified big number of Record Flows on one sObject
Multiple triggers on one sObject
Excessive lack of .startTest() and .stopTest()
No checking collection emptiness before DML
No Test data factory/builder
No flags to deactivate trigger declaratively
SOQL without WHERE or LIMIT outside Batch
No Fault Paths in Flows
Hard-coding UI text instead of Custom Labels
Hard-coded authentication instead of using Named Credentail
Calling Queueable in loop without control mechanism or logging
