Astro Boy - Tetsuwan Atom - Atom Heart no Himitsu (Japan)

As a 2D action-adventure GBA title, Astro Boy - Tetsuwan Atom - Atom Heart no Himitsu rewards players who master Astro's core abilities and explore every corner of each level. Start by getting comfortable with Astro's basic moves: his double jump can be chained into rocket flight by holding the jump button, which lets you reach hidden platforms and avoid enemy attacks across open levels. Astro's arm cannon is your primary long-range weapon for taking out enemies from a distance, while his melee punch works well for close-quarters combat and breaking open crates that hold health pickups and hidden secret tokens. One of the most underused abilities in the game is Astro's eye scan: activate it in every new area to reveal hidden platforms, secret passages, and hidden story fragments that expand on the mystery of Atom's heart. For early game levels set in the underground robot factory, prioritize taking out flying drone enemies first with your arm cannon before engaging ground-based melee robots, as they can hit you from off-screen quickly. When facing mid-bosses, always keep moving and use short rocket flight bursts to dodge their heavy area-of-effect attacks, then strike their glowing weak points when they pause after an attack. For the final boss battle, don't waste your arm cannon ammo on random attacks: wait for the boss to expose its core after a charge attack, then unload a full volley of shots to deal massive damage. Collect all 12 hidden secret tokens scattered across every level to unlock the true ending of the game, which reveals the full secret of Atom's heart and adds an extra bonus concept art gallery you can view from the main menu. If you're struggling with low health, look for hidden repair stations in the background of most levels, which can be activated with a melee punch to fully restore your health.