Obsidian Slumber
Valley of dormant volcanoes. Valley of dormant volcanoes
18+ UK adults. Fictional Play Credits. No monetary value or valuable prizes. Play at your pace.
Inside this world
Valley of dormant volcanoes. Discover original sculpted symbols and a setting built around this craft, with fictional-credit play and a complete native preview.
The reel field
Five reels and three rows use 20 fixed lines. Match at least three ordinary symbols from the left along a line. Every qualifying ordinary symbol and line is evaluated, including all-Wild matches. The longest matching length for that symbol pays.
Its signature feature
Winning combinations during free rounds can cascade into replacement symbols, up to four additional evaluations.
Wild and collector rules
Heart of Basalt substitutes for ordinary symbols. Free-round emblems, medallions and collection emblems are excluded from ordinary combinations. The largest marked-cell multiplier in a matching combination applies. A Wild on either outer reel collects the credit values on visible medallions; two outer Wild reels produce two collections.
Eight free rounds
Three opening free-round emblems award eight free rounds at the current play level. They cannot re-trigger. Each free round, replacement evaluation and free re-spin is included in the opening paid cycle.
The bonus choice
Beneath the Crust. Three opening credit medallions reveal nine themed vessels. Choose up to three independent hidden awards, use Guided play, or Collect the current bonus early. No extra play level is charged.
Saved progress
The account saves your rounds and fictional balance. A pending bonus must be completed before another paid cycle. Reloading can restore a pending choice; Replay last round watches the saved outcome without charging credits.
Play levels and limits
Choose 50, 100, 250, 500 or 1,000 fictional Play Credits. A complete paid cycle is capped at 70,000 times its play level. Animation speed, sound, earlier rounds and recorded previews do not affect outcomes. Credits cannot be purchased, transferred or redeemed; no prizes of value are offered.
Try it your way
The full game needs a free adult account. Its native recorded preview is available without registration and cannot change a balance.
Symbol pays
Multiples below apply to the selected play level before marked-cell multipliers. The active chapter’s table appears inside the game. Fractional awards accumulate and round to whole Play Credits as the round settles.
| Symbol | 3 reels | 4 reels | 5 reels |
|---|---|---|---|
| Volcanic tuff | 1.7797× | 4.4492× | 12.4577× |
| Obsidian shard | 1.4237× | 3.5593× | 9.7882× |
| Glowing fissure | 1.1568× | 3.1144× | 8.0085× |
| Sulphur crystal | 0.9788× | 2.6695× | 6.2288× |
| Lava geode | 0.6229× | 1.7797× | 4.4492× |
| Basalt spiral | 0.5339× | 1.5127× | 3.5593× |
| Mineral hammer | 0.4449× | 1.2458× | 3.1144× |
| Steam vent | 0.3559× | 1.0678× | 2.6695× |