Since Adobe ended support of Flash. I downloaded the original files from bfdia.tv/5b. Includes Flash Player.

-BFDIA 5B

Simple timer overlay mod that displays
a) your current time
b) your total time
c) your best time for that level
This mod also shows your best time when hovering over a level button.
This mod is approved for speedrunning, and the timer overlay can be turned off by pressing "T", so there's no good reason not to just use it.
If you want to submit a run, use the GitHub release. The GameJolt release uses a different and more accurate timing method, so for obvious reasons it can't be used on the leaderboard. I recommend it for practice because you can get a more accurate best time.

5b Timer Mod

Spreadsheet for challenges and category extensions. Includes Least Deaths and Blindfolded levels.

Challenges spreadsheet

Submit runs for the challenges spreadsheet here.

Challenges submission form

Game Link

HTML port of the original BFDIA 5b Flash version that is available on the web and is legal for speedruns. Made by Coppersalts.

HTML5b

LiveSplit (LS) is a timer app, made by CryZe107, and wooferzfg. It has an adjustable UI, allowing you to configure it to the way you like. LS is the most popular speedrun timer.

LS: https://livesplit.org/downloads/

LiveSplit (timer)

https://obsproject.com/forum/resources/nohboard.44/

A link to download Nohboard, one of the easiest input displays to use. Additional proof is required for all untied level records and top 3 full-game runs, and an input display is one way to do it.

Nohboard download page

MeesterTweester

carykh

KorZen

imaperson1060

5ber

Battle For Dream Island Again 5b

025. Would you die for me?

028. Build my pathway

049. Take the plunge

Yariktopikser

bluefan77

PiliFangirl

okman241

IGT (Archived)

TAS (Archived)

1704

Unsure

327My fir

Timing method

Deaths

Carelics

Battle For Dream Island

BFDIA 5b challenges spreadsheet; Deathless has been archived

5b speedrun Discords

Play it here online

Level 2 Wall Clip

Level 1 new category

New 17 Complete% TAS

Gave2haze

luccdot

Solarlake

FlowerBFDISpeedruns

Name	Manager
-BFDIA 5B by loiid	Deleted 1 year ago
5b Timer Mod by imaperson	imaperson1060 3 years ago
Challenges spreadsheet by MeesterTweester	MeesterTweester 4 years ago
Challenges submission form by MeesterTweester	MeesterTweester 4 years ago
Game Link by carykh	MeesterTweester -
HTML5b by KorZen	KorZen 4 months ago
LiveSplit (timer) by 5ber	5ber 12 days ago
Nohboard download page by KorZen	KorZen 17 days ago