  When you complete a mode you will be asked if you want to continue playing. If you continue, you will enter freeplay mode. You can't save in Freeplay Mode. It lags a lot after you pass rounds 85+.
- There are 999 BFBs in round 250, the very last round.
Trivia
On the newer versions of BTD4, it displays a message about lag
.Note that the message is very similar to the other messages displayed
