Like its predecessor, the Mega-CD version features a Red Book audio soundtrack composed by Spencer Nilsen and additionally features cinematic sequences that recount the story of the first game.
The Tides of Time continues from the ending of the original game, in which Ecco had saved his dolphin pod and the Earth from the Vortex aliens. Still wielding the powers granted to him by the ancient life form known as the Asterite, Ecco has since returned to his peaceful life in Earth's waters. One day, while Ecco is out exploring an underwater cave, a powerful earthquake goes off and causes an avalanche. As Ecco recovers, he learns that the Asterite's powers have left him (indicated by the return of his need to surface for air). His fellow dolphins explain that something has killed the Asterite and is now spreading fear among the ocean life.
Soon after, Ecco meets a dolphin with unusually long fins. She is his descendant, Trellia, who takes him to the distant future to speak with "an old friend". In the future, the ocean has developed its own mind and is connected across the planet by waterways traveling through the sky. The dolphins of the future have also evolved, as they are now able to fly through a combination of internal helium sacs and telekinetic powers.
After exploring the future, Ecco finds his old friend the Asterite, who explains the events that had transpired in Ecco's time. Though Ecco had defeated the Vortex, the Vortex Queen survived and followed him back to Earth, where she killed the Asterite of Ecco's time and now nests and feeds to restore her brood. The Asterite then tells Ecco that when he used the Atlantean Time Machine to save his pod, he split the stream of time in two. One possible future for Earth is a bright, happy world of flying dolphins, while the other is a dead, mechanical world sucked dry by the Vortex. As a result, Ecco is referred to as "the stone that split the stream of time in two." Ecco must restore the Asterite and vanquish the Vortex Queen again to prevent the dark future from becoming the fate of life on Earth.
Gameplay
The Tides of Time maintains the same gameplay as its predecessor. Ecco swims in any direction with the D-pad. His main attack is to ram into enemies at high speeds with . His sonar is used to communicate with other cetaceans and interact with certain objects such as crystal glyphs by pressing . It can also bring up a map of the area through echolocation by holding . By combining his charge and sonar, Ecco can attack enemies from a distance. Certain enemies are harmed by his sonar alone. Ecco can swim faster by pressing and maintain this speed by continuing to hold it.
As a mammal, Ecco is required to either surface for air or locate an air pocket at regular intervals. Air pockets can be found by spotting bubbles coming from the ocean floor or by looking for a bubble in Ecco's echolocation map. His health is measured by a separate meter above the air meter. It is depleted by enemies or when his air meter runs out. Ecco can heal damage by charging at fish to eat them. If Ecco loses all of his health, the player starts the level over. There is no life system, so the player can retry as many times as desired.
New puzzles include following other dolphins through an underwater maze and a "scavenger hunt" in which Ecco must collect the Asterite's missing globes. As with the first game, the sea contains many giant crystals known as glyphs, which perform a number of functions, such providing messages, blocking passageways, or acting as keys or checkpoints. Some gylphs are cracked and must be reassembled by Ecco to function. Two new power-ups are introduced, the Pulsar and the Metasphere. The Pulsar grants Ecco the ability to fire a multi-directional sonar attack at enemies for the duration of the stage. The Metasphere transforms Ecco into a different animal depending on the level, including a seagull, a jellyfish, a shark, a school of fish, and a Vortex drone.
Some stages contain teleport rings, which transport Ecco to a pseudo-3D stage in which he must swim through moving rings while avoiding or attacking enemies. The player is forced to restart if Ecco misses too many rings or takes too much damage.
The player can choose the difficulty level in the opening cavern. The path to the upper-right starts the game on the Easy difficulty. The path directly above Ecco, accessible only after charging the shells to break them, starts the game on the Hard difficulty. The path to the right starts the game on Normal difficulty, in which the game automatically adjusts the difficulty between Easy and Hard based on the player's performance, including factors such as the amount of time taken to complete levels.
Levels
Home Bay
Crystal Springs
Fault Zone
Two Tides
Trellia's Bay
Skyway
Sky Tides
Tube of Medusa
Aqua Tubeway
This level is only played on Hard mode.
Skylands
Fin to Feather
Eagle's Bay
Asterite's Cave
The Lost Orcas
Maze of Stone
This level is only played on Hard mode.
Four Islands
Sea of Darkness
Vents of Medusa
Gateway
Sea of Green
Moray Abyss
Sea of Birds
The Eye
Big Water
Deep Ridge
The Hungry Ones
Secret Cave
Lunar Bay
Vortex Future
Black Clouds
Gravitorbox
Globe Holder
Convergence
Dark Sea
New Machine
This level is only played on Hard mode.
Vortex Queen
Epilogue Levels
After the end credits, the player can find a teleport ring that returns Ecco to the Asterite, where he is told to travel to Atlantis and destroy the Time Machine in order to prevent the stream of time from ever being split again. Upon completing these epilogue levels, the player is given a "Secret Password." This was meant to be used in a sequel but was ultimately never used for anything.
Home Bay
Epilogue
Atlantis
Fish City
City of Forever
History
Release
In France, as in the launch of Ecco the Dolphin, a part of the profit of the sales of Ecco: the Tides of Time was donated[28] to Europe Conservation (European Organization For The Conservation of Natural Resources and Cultural Heritage)[29][30][31][32], this time to help them in the acquisition of high-performance scientific equipment[33] for their marine research boat, most precisely, a "Dual-Beam Echo Integration Sonar"[28][34].
Legacy
The Mega Drive version of the game has recently been re-released as part of the Wii's Virtual Console service.