Trog/Islands 31-40

Island 31 (Bonus Stage)
At the start of this island, the text "BONUS WAVE. TROG FEAST! ALL YOU CAN EAT! (YOU HAVE 25 SECONDS)." will appear on the screen; all four triceratopses will then automatically transform into tyrannosauruses, as the "Tyranno-Power" theme begins to be heard from the Yamaha YM-2151, and twenty-four Trogs, twenty-one Brown and three Red, emerge from the ground and start running around the island in terror. You will receive 10000 points for every Trog you eat - and if you eat all twenty-four of them between you, before the timer runs out, the text "OUTRAGEOUS MEAL! 100,000 POINTS FOR EVERYONE." shall appear on the screen (however, if you do not manage it the text "TIME IS UP!" will appear instead). After this stage, you will all be treated to a fourth cutscene of "Trogs' Cave" which shows a Brown Trog carving a picture of a picture of a triceratops being burned over a flame onto the cave wall, then imagines himself using a club to create a fire, as one of the triceratopses walks onto it and gets his (or her, if Gwen) flesh burned off.

Islands 32 and 33
On these islands, there are thirty-six eggs (for an 18th time, of each colour, if you're not playing alone; if Bloop or Spike are present, the eggs in the top-right and bottom-left corner will not be there, and if Rex is not present, there will be one in the top-left corner), Brown and Red Trogs, and a narrow pool.

Islands 34 and 35
On these islands, there are thirty-five eggs (for a 19th time, of each colour, if you are not playing it alone; if Bloop or Spike are present, the eggs in the top-right and bottom-left corner will again not be there, and if Rex is not present, there will again be one up in that top-left corner), and only Red Trogs.

Islands 36 and 37
On these islands, there are thirty eggs (for a 20th time, of each colour, if you are not playing it alone; if Bloop or Spike are present, the eggs in the top-right and bottom-left corner will again not be there, and if Rex is not present, there will again be one in that top-left corner), and Brown and Blue Trogs.

Islands 38 and 39
On these islands there are thirty-two eggs (for a 21st time, of each colour, if you are not playing this alone; if Bloop or Spike are present, the eggs in the top-right and bottom-left corner will again not be there, and if Rex isn't present, there will again be one in the top-left corner), and all four types of Trogs.

Island 40 (Bonus Stage)
At the start of this island, the text "BONUS WAVE. DIAMOND MINE! GRAB THE JEWELS! (YOU HAVE 15 SECONDS)." will appear on the screen, as fifty-six randomly-generated Jewels appear over the island; the Rubies are worth 500 points, while the Emeralds are worth 1000 and the Diamonds are worth 2000. If you manage to collect all fifty-six of the jewels between you before the timer runs out, the text "ROCK ME BABY! 100,000 POINTS FOR EVERYONE." will appear on the screen (but, if you do not, the text of "TIME IS UP!" will appear instead) - and if your triceratops falls into the enormous hole in the centre of the island, he (or she, in the case of Gwen) shall be eliminated from the stage. After this stage, you will be treated to the fifth (final) cutscene of "Trogs' Cave", which shows a Brown Trog carving Albert Einstein (1879-1955)'s theory of relativity, E=MC², into the cave wall, then carving a picture of a square wheel over it, and imagines a round wheel rolling over one of the triceratopses (although his Blue tribesmen had already made it).