Swing a Rubber Sword: How to Beat All 21 Waves, Parry Attacks and Unlock Boss Rush

A practical browser-game guide to the golden-tip critical hit, 1.5× reversal, environmental damage, seven bosses, controls and the no-healing Boss Rush.

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To clear the game, swing your mouse in arcs outside the circle around your character, strike with the golden glowing tip, reverse direction for the 1.5× bonus and knock enemies into spikes. Survive all 21 waves, including a boss every third wave, to unlock the seven-boss challenge.

Where to play and what to press

Play the developer's itch.io edition or the unityroom edition. You need a desktop browser and mouse; touch-only phones are not supported. Click inside the game once to focus it. Move with WASD or arrows; swing with the mouse; dash with Space. When the special meter is full, left-click for Long Sword or right-click for Mighty. Hold R during play to retry, use Esc/P to pause and F for in-game fullscreen.

A clear route through the 21 waves

  1. Begin by tracing wide arcs beyond the ring around your fighter. The hand moves first; the flexible blade follows late. Learn where the tip ends up rather than chasing an enemy with the handle.
  2. Watch for the tip to glow gold at full extension. Contact at that moment gives a critical hit.
  3. Change swing direction after a strike. The documented Reversal bonus is ×1.5; spinning one way for too long causes dizziness.
  4. Approach fights with the environment in mind. Launch enemies into spikes, bumpers or other enemies instead of relying on direct hits alone.
  5. Use a fast swing to reflect incoming projectiles. Time a swing against a red-glowing attack to parry; if you cannot read the timing, dash to reposition rather than gamble.
  6. Dealing damage fills the special meter. Test Long Sword for reach and Mighty for force, but treat that division of uses as a tactical suggestion, not a proven optimum.
  7. Expect boss encounters at waves 3, 6, 9, 12, 15, 18 and 21 based on the stated three-wave cadence. The normal mode restores a little HP after defeating a boss. Prioritize survival over a perfect score, and finish the final Ghost King encounter.

Quick decision table

Situation Input or decision Documented outcome Evidence
Tip glows gold Connect with the extended tip Critical hit Developer
Long clockwise or counterclockwise spin Reverse the swing ×1.5 Reversal; avoid dizziness Developer
Enemy near arena hazards Strike toward spikes/bumpers Heavy collision damage Developer
Projectile or red attack Fast reflection / timed parry Defensive counter Developer
Full special gauge Left / right mouse button Long Sword / Mighty Developer
Every third wave Defeat boss Some HP restored in normal play unityroom
Finish the campaign Clear all 21 waves Boss Rush unlocked Both pages

Bosses, score and troubleshooting

The seven named bosses are Crown Boss, Swordsman, Ball Thrower, Rubber Serpent, Flail Giant, Orb Mage and Ghost King, whose fighting style changes by form. The developer does not publish a boss-by-boss order or frame-perfect solutions, so those are not asserted here. Observe attacks first, then choose reflection, parry, a hazard knockback or a dash.

For a high score, keep hitting without taking damage to build a combo worth up to ×3.0 points. No-damage waves and quick boss defeats grant bonuses. Those bonuses are not required to complete the campaign. If input seems dead, click the game canvas; if performance suffers, choose Standard graphics and adjust mouse lock or sensitivity in Settings.

Boss Rush after the ending

The unlocked mode pits you against all seven bosses without healing between them. Split times and your ten best attempts are recorded locally. Preserve HP even more carefully than in the main campaign.

Bottom line

The winning fundamentals are tip timing, reversing your swing and using the walls. These are strategies derived from the official instructions, not a claim of a personally completed run; exact boss attack scripts and an optimal route remain unverified.

References (2)

Next game guide: Shadowverse Worlds Beyond Set 9 Aggro Nightmare Deck Guide: Last Words, Burn, then Storm

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