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Sure, sorry if it's messy.

Oh, sorry, I explained my problem poorly, they can climb walls but they can't when riding. I can set it to true to give it the climbing ability, but it climbs down air blocks when it falls.

Sorry for the late reply, but it appears that the text block you sent is blank.

So I've been trying to create a ride-able spider, everything works fine, but they don't appear to have the ability to climb walls when I start riding them. Here's the code, it's taken directly from the EntitySpider code. @Override public void onUpdate() { super.onUpdate(); if (!this.world.isRemote) { this.setBesideClimbableBlock(this.collidedHorizontally); } } I'm sorry if this is a basic fix, I'm pretty new at modding and Java as a whole.