# Content
- explanation/tutorial
- 'about'/contact

## Curriculum
- how to negate a signed binary integer?
- how to convert decimal to binary?
- how to convert hex to binary?
- how to convert binary to hex?
- how many unsigned integers can be represented in ____? (a byte, nibble, word)
- how many _signed_ integers can be represented in ____? (a byte, nibble, word)
- how to determine if a binary int is even/odd?
- what can be said of a binary integer who ____ bits are 0?
- if all positions in a binary integer are 0 except position ____, what number does it represent?
- if all positions in a binary integer are 1 except position ____, what number does it represent?
- memorize powers of 2 up to 16 (speed round)
- what happens to the represented integer after shifting to the left?
- what happens to the represented integer after shifting to the right?
- what is the binary for the value 2^n - 1?
- what is sign extension? how do you do it?
- what is contraction?
- what is zero extension?

# Design
- color and font
- toggleable column labels
- animations
  - [x] 'nuh-uh' shake for wrong answers
  - [ ] nice reward animations for right answers
  - [ ] make the placeholders become real text for a split second before starting
- processor graphic/animation
  - diff processors for different bits

## mobile
  - make autofocus work on quiz
  - remove "[enter]" from start button
  - on-screen keyboard, like wordle
  - make it all on one line 
    - make the font smaller or the div wider
  - put a 'submit' button in (or auto-submit?)
  - add a range slider for easier input?

# Features
- keyboard shortcuts
  - ctrl-c to go back to menu
- specify what you already know, then prove it (modular learning)
- save progress
  - local storage
  - login
- timed
- keyboard shortcuts with help overlay
- leaderboard
- show warning when specifying invalid number of bits or problems
- uncomment PDF part
- add PDF export in pure front end
- cheat/human detection