(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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SOQLs in loop
Excessive lack of .startTest() and .stopTest()
DMLs in loop
Non‑descriptive variable names in Flow
Hard-coded ID
No test data factory or builder
Excessive amount of System.Debug()
All classes in without sharing mode
Code in trigger instead of Trigger Handler
Getting IDs by loop instead of Map(records)
Missing bulk tests in test classes
No assertions in Tests
Hard-coded authentication instead of using Named Credentials
Checking collection emptiness before DML
Multiple triggers on one sObject
Multiple Record Triggered Flows on same OperationType on one sObject
Public Read/Write OWDs
SOQLs without WHERE or LIMIT outside Batch
No Fault Paths in Flows
Gigantic Flow instead of multiple Subflows
Using Profiles instead of Permission Sets
Only catching general Exception in try-catch
No flags to deactivate trigger and validation rules declaratively
