Upgrade the forge
Spark Forge asks you to heat a blade and strike inside a sweet spot before an order clock runs out. Between runs, coins buy upgrades across four listed categories. Identify whether heating, striking or order completion is currently slowing progress and choose an upgrade that addresses that point. The game also has a star rebirth mechanic; read its in-game description before deciding when to use it.
Upgrade for the next defense
Stone Keep’s buildings contribute to the island keep’s defense and resource flow. The next round matters: prepare walls, towers, cannons or mines according to the threats you see. Defense rounds use catapult stones against incoming raiders, while raid rounds send knights to enemy camps. Upgrades are part of a round-based strategy rather than a single tap timing loop.
Choose based on progression style
If you like improving a work cycle between timed orders, open Spark Forge. If you prefer a persistent base and alternating defend and raid actions, try Stone Keep. Both titles list upgrades in their mechanics, but they do not share the same progression system. Use their cards for the exact controls and choices available.
Questions about upgrade games
Which game has forge upgrades?
Spark Forge lets coins buy bellows, anvil, apprentice and metal upgrades between runs.
What can be upgraded in Stone Keep?
The game lists walls, archer towers, cannons and gold mines as buildable and upgradeable structures.