Running through the list of tricks and glitches on
http://www.interguild.org/blogs/?id=5232:
Removed in (or not planned for) HATPC Reborn:
Air refill through ladders
Disappearing arrows
Disappearing dynamite
Duckswimming (I plan to use the ducking hitbox for all swimming)
Dynamite going through terrain
Dynamite skipping corners
Fast swimming (Swim speed will always be the same)
Getting stuck in corners
Getting stuck in objects underwater
Jumping through arrows and dynamite
Jumping through corners underwater
Jumping through corners with ladders
Jumping through corners with platforms
Jumping through diagonally touching spikes
Monsters falling through solid objects
Monsters walking through solid objects
Objects falling through the floor
Object respawning
Retaining momentum when breaking through wooden crates
The Great Glitch of '07
The Great Glitch of '08
Shockwave Error
Water Drain (Although I might add a tile that does that.)
Water taps going through walls
Water rising through terrain
Zero G
Already on the list:
Duckjumping
What even is this:
Duckclimbing
Jumping ontop of a falling crate at 4 tiles high
Jumping out of a crawl space as a crate is falling in front of it
Jumping over spikes 4 tiles high
Jumping through spikes at a corner
Near Zero G
Phantom Crates
Rolling multiple boulders at the same time
Stopping arrows and dynamite with boulders
Turning boulders around
Not relevant for the tutorial:
'Error; you are stupid'
Floorless/Wallless/Ceilingless Caves
Getting stuck in objects through invincibility
Multiple hearts and gems
Multiple doors
Removing rows from your cave
Standing on the edge of spikes
Untitled Caves
Uploader character limits
Things to discuss:
Fake tiles - I'm not sure I want to implement these at all. They seems antithetical to the spirit of HATPC - that is, the spirit of transparency. Generally in HATPC you can see what's going on so you never feel cheated when you fail - you feel like it was your fault. A tile that appears to be something it's not violates that spirit.
Getting stuck in objects through platforms - This is mostly removed in HATPC Reborn with the exception of with boulders, but jumping into boulders with platforms
is worth including in a tutorial.
Jumping between arrows - As-is this is not really a thing in HATPC Reborn - in 0.2.6 I just removed the ability to fit between vertical arrows, and while you could theoretically duck-jump through horizontal arrows I think in practice you don't hang in place for long enough. I might re-introduce jumping through vertical arrows though.
Objects falling through arrows - Totally a thing. IDK if it's worth a spot in the tutorial though. I suppose it can be introduced in practice without being explicitly explained.
Pausing by right-clicking - Not a thing currently, but you can pause by pressing K. That might be worth introducing in the tutorial.
Starting invincibility - Probably doesn't need to be explicitly explained.
Swimming between arrows - Will probably be a thing. I'll add it to the list.