(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.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
Getting IDs by loop instead of Map(records)
Checking collection emptiness before DML
Gigantic Flow instead of multiple Subflows
All classes in without sharing mode
Excessive amount of System.Debug()
SOQLs without WHERE or LIMIT outside Batch
Hard-coded ID
Hard-coded authentication instead of using Named Credentials
Only catching general Exception in try-catch
DMLs in loop
Missing bulk tests in test classes
Excessive lack of .startTest() and .stopTest()
No assertions in Tests
Public Read/Write OWDs
Non‑descriptive variable names in Flow
SOQLs in loop
Exactly 75% test coverage
Using Profiles instead of Permission Sets
No flags to deactivate trigger and validation rules declaratively
Multiple Record Triggered Flows on same OperationType on one sObject
