The 6 bosses: attacks, levels and exact timings

The game’s hint: “It throws parcels up at you: sidestep them”

• Rises into view 640 px below you, holds station there and follows your lane at 240 px/s, weaving up to 150 px either side — so parcels come in at an angle.
• Tell: 0.35 s with the parcel held up and its aim line lit, then it is thrown up at you.
• A parcel is a 56 px box that tumbles; the box you see is the box that kills.
• The only boss with a triple, at level 3.

The game’s hint: “They fall where the top glows — some bounce off the walls”

• Rocks fall from the top of the screen. Tell: 0.7 s of glow at the top edge, in the lane the rock will fall down.
• A bounce rock leaves its glow slanting toward the nearer wall, hits it 300 px above you and comes back across your level where a straight rock would have. Its path is drawn, ember by ember, while it glows.
• A rock is a 60 px box. No triples: three slow rocks abreast would be a wall.

The game’s hint: “Don't stay in its beam: half a second and you're abducted”

• Each try: it slides under your lane (0.4 s), LOCKS it — its lights spin up and the lane lights to the top of the screen — for 0.70 / 0.60 / 0.50 s by level, then climbs its tractor beam for 1.40 / 1.25 / 1.10 s.
• The beam is 160 px wide and PULLS you toward its middle at 140 / 160 / 180 px/s — always weaker than your bank (470 px/s): from the middle at full bank you are out in about half a second.
• While on, the beam drifts after you at 45 / 80 / 115 px/s, but never nearer a wall than 90 px: the strip against either wall is always safe.
• Stay in the beam 0.5 s in a row and you are ABDUCTED: the run ends. Still in it when the saucer reaches your level, and its rim takes you too.
• The beam itself does not kill; it is green.

The game’s hint: “Its cactus balls sprout roots to the sides: dodge wide”

• A saguaro riding a dust devil 620 px below you, following your lane. Tell: 0.45 s with the ball held over its head and the aim line lit.
• Each cactus ball sprouts ROOTS 470 px below you: a bar reaching 118 px either side of the ball, grown in 0.13 s — about a second of warning before it reaches you. Dodge wide, not just aside.
• Roots stop 84 px short of each wall, so a dodge toward a wall always has room. Only one throw’s roots are ever in the air.
• Its forks leave 107 px of clear air either side of your centre: hold still between them.

The game’s hint: “Dodge the icicles, and keep out of its frost ray”

• Two attacks. ICICLES fall from the top of the screen: 0.7 s of cracking ice at the top edge in their lane first, then a 32 × 76 px icicle straight down. They kill. The first throw is always an icicle.
• The FROST RAY has no tell: it shoots out of the wand and its tip climbs at 1,400 px/s, reaching your level in 0.37 s. It stays on 1.2 / 1.3 / 1.4 s and sweeps after you at 80 / 110 / 140 px/s, never nearer a wall than 90 px.
• The ray never kills: it CHILLS. Every moment in it slows you more — down to half speed at most — and the chill thaws over about 2 s. A chilled plane banks slowly into the next icicle’s lane, which is the real danger.

The game’s hint: “Get out of its shadow before the ghost appears”

• A SHADOW gathers on you — at your level, in your lane, keeping pace — for 1.05 / 0.97 / 0.90 s by level. It never kills.
• Then the GHOST appears exactly where the shadow was, solid for 0.35 s (a 92 × 100 px box), and fades harmlessly over 0.3 s.
• Get out of the shadow sideways before it fills in: about 84 px of bank is enough. Hauntings never overlap.