Pick a difficulty and get a random compound to solve end to end. Finish one, get another; the pool never runs dry.
Draw a random compound from any tier and start solving right away.
Neutral molecules that follow the octet rule.
You will practice
Counting the budget, choosing the center, and closing every octet.
One twist at a time: a charge, a resonance pair, or an octet exception.
Formal charges on ions, resonance, and the atoms that stay below eight.
Hypervalent centers that expand past eight electrons.
Expanded octets, often stacked with charge and resonance at once.