Comparing several pledge managers that help with Kickstarter fulfillment:

http://www.jamesmathe.com/story-of-the-3-little-pledge-managers/

Advice for writing rulebooks that are understandable, consistent, and usable:

http://www.leagueofgamemakers.com/following-rules-is-hard-writing-rules-is-harder/

An overview of playtesting--what it is and how to do it:

https://geekandsundry.com/how-to-make-a-game-playtesting-advice-from-game-designers/

“The real danger with making rulebooks is that if the wrong rule is more intuitive than the right one then your players will never open the rulebook again.”

— Eric Yurko

“When you design a game, 1. Start with something innovative. This is your best chance to end up with something innovative.”

— Reiner Knizia

Advice for designing cooperative games from fans of the genre (audio):

https://soundcloud.com/user-318456537/coop-cast-episode-27-design-discussion-with-matt-leacock

...and from a skeptic of it (audio):

http://www.boardgamedesignlab.com/the-two-types-of-cooperative-games-with-peter-hayward/

A list of different kinds of playtesting you could perform:

https://boardgamegeek.com/blogpost/75551/defining-playtesting-part-2

How to make your game more accessible to more people (audio):

http://www.boardgamedesignlab.com/how-to-make-your-game-more-accessible-with-brandon-rollins/

Kickstarter advice from Pandasaurus Games:

https://tompetgames.wordpress.com/2018/04/09/kickstarter-tactics-with-the-creators-of-dinosaur-island/

“Go meet other designers. Play their games, have them play yours. Talk about design.”

— Chris Anderson

The role of progression in a game design:

http://makethemplay.com/index.php/2018/04/09/progression/

A list of goals you might have in mind for any given playtest:

https://boardgamegeek.com/blogpost/75622/why-are-you-playtesting

How "design patterns" can be used to guide a game toward the experience you want (audio):

http://ludology.libsyn.com/ludology-episode-173-patternity

More than 780 free emojis, useful for prototypes:

http://emoji.streamlineicons.com/

Board game design sessions from GDC 2018 (video):

https://www.gdcvault.com/search.php#&category=free&firstfocus=&keyword=%22board+game%2Bdesign%2Bday%22&conference_id=175

“It doesn’t really matter how good your game is if nobody can understand the rulebook. Clear rules writing is important - unclear rules can sour the entire experience.”

— Robin David

How much should you listen to playtesters?

https://boardgamegeek.com/blogpost/75454/how-much-should-you-listen-playtesters

The theme for the April 24-hour contest is "egg":

https://boardgamegeek.com/thread/1969684/24-hour-contest-april-2018

What's your endgame--how different ways of ending a game change players' experience:

http://mavengames.co.uk/the-end-of-the-game/

How much information you should share about a work in progress:

https://boardgamegeek.com/blogpost/75360/sharing-info-keeping-game-under-wraps