While collecting gems is part of the main quest, achieving 100% gem collection in every level can be considered a side activity in itself. Gems are often hidden in clever locations: behind waterfalls, on high ledges, inside explosive barrels, or even requiring specific power-ups to reach. If you're missing a few gems in a level, re-explore thoroughly, looking for suspicious cracks in walls, unlit torches, or areas you might have overlooked. Sparx will point to the nearest gems when you're close, so pay attention to his direction.
