diff --git a/games-dsl/common/src/main/kotlin/net/zomis/games/components/resources/ResourceEntry.kt b/games-dsl/common/src/main/kotlin/net/zomis/games/components/resources/ResourceEntry.kt
new file mode 100644
index 00000000..85a09c6b
--- /dev/null
+++ b/games-dsl/common/src/main/kotlin/net/zomis/games/components/resources/ResourceEntry.kt
@@ -0,0 +1,38 @@
+package net.zomis.games.components.resources
+
+interface ResourceEntry {
+    val resource: GameResource
+    val value: Int
+    operator fun component1(): GameResource = resource
+    operator fun component2(): Int = value
+}
+interface MutableResourceEntry: ResourceEntry {
+    override var value: Int
+    operator fun plusAssign(value: Int)
+    operator fun minusAssign(value: Int)
+    operator fun timesAssign(value: Int)
+    fun coerceAtMost(value: Int)
+    fun coerceAtLeast(value: Int)
+}
+
+class ResourceEntryImpl(override val resource: GameResource, override var value: Int): MutableResourceEntry {
+    override fun plusAssign(value: Int) {
+        this.value += value
+    }
+
+    override fun minusAssign(value: Int) {
+        this.value -= value
+    }
+
+    override fun timesAssign(value: Int) {
+        this.value *= value
+    }
+
+    override fun coerceAtMost(value: Int) {
+        this.value = this.value.coerceAtMost(value)
+    }
+
+    override fun coerceAtLeast(value: Int) {
+        this.value = this.value.coerceAtLeast(value)
+    }
+}
diff --git a/games-dsl/common/src/main/kotlin/net/zomis/games/components/resources/ResourceListener.kt b/games-dsl/common/src/main/kotlin/net/zomis/games/components/resources/ResourceListener.kt
new file mode 100644
index 00000000..bed751e3
--- /dev/null
+++ b/games-dsl/common/src/main/kotlin/net/zomis/games/components/resources/ResourceListener.kt
@@ -0,0 +1,14 @@
+package net.zomis.games.components.resources
+
+// Triggers: "When you lose more than 3 gold", get 1 gold.
+// "When you gain gold", draw a card.
+// "When you gain gold", also gain 2 trees.
+
+interface ResourceListener {
+    fun onChange(resource: GameResource, oldValue: Int, newValue: Int): Int = newValue
+    fun keepListener(): Boolean = true
+}
+
+interface ListenableResourceMap {
+    fun addListener(listener: ResourceListener)
+}
diff --git a/games-dsl/common/src/main/kotlin/net/zomis/games/components/resources/ResourceMap.kt b/games-dsl/common/src/main/kotlin/net/zomis/games/components/resources/ResourceMap.kt
new file mode 100644
index 00000000..7537aee8
--- /dev/null
+++ b/games-dsl/common/src/main/kotlin/net/zomis/games/components/resources/ResourceMap.kt
@@ -0,0 +1,96 @@
+package net.zomis.games.components.resources
+
+interface ResourceMap {
+    // val owner: T // TODO: Does this make any sense? Considering the messes of generics that would occur below? What would the concrete use-case be?
+    operator fun get(resource: GameResource): Int?
+    fun getOrDefault(resource: GameResource): Int
+    fun getValue(resource: GameResource): Int
+    operator fun plus(other: ResourceMap): ResourceMap
+    operator fun minus(other: ResourceMap): ResourceMap
+    operator fun times(value: Int): ResourceMap
+    fun has(resource: GameResource, value: Int): Boolean
+
+    fun has(resources: ResourceMap): Boolean
+    fun resources(): Set<GameResource>
+
+    fun entries(): Set<ResourceEntry>
+    fun merge(other: ResourceMap, merger: (owned: Int?, otherValue: Int?) -> Int): ResourceMap
+    fun map(function: (ResourceEntry) -> Pair<GameResource, Int>): ResourceMap
+    fun filter(function: (ResourceEntry) -> Boolean): ResourceMap
+    fun <R> fold(initial: R, operation: (acc: R, ResourceEntry) -> R): R
+
+    operator fun unaryMinus(): ResourceMap
+}
+
+interface MutableResourceMap: ResourceMap {
+    operator fun set(resource: GameResource, value: Int)
+    operator fun plusAssign(other: ResourceMap)
+    operator fun minusAssign(other: ResourceMap)
+    operator fun timesAssign(value: Int)
+    fun clear(resource: GameResource)
+
+    /**
+     * Moves all resources that are possible to move. Ignores any modifiers on this object.
+     */
+    fun payTo(resources: ResourceMap, destination: ResourceMap): Boolean
+}
+
+// move (values) to (other)
+// "For the next 5 turns, you always have one wildcard to spend" --> How to move it? Probably don't force it to be moved
+
+// Resource aliases (not immediate problem)
+
+// Dynamic retrieval, modifiers.
+
+// See Splendor Money and Caravan in Spice Road
+
+class ResourceMapImpl(
+    private val resources: MutableMap<GameResource, ResourceEntryImpl> = mutableMapOf()
+): ResourceMap {
+
+    override fun get(resource: GameResource): Int? = resources[resource]?.value
+    override fun getOrDefault(resource: GameResource): Int = resources[resource]?.value ?: resource.defaultValue()
+    override fun getValue(resource: GameResource): Int = resources.getValue(resource).value
+
+    override fun plus(other: ResourceMap): ResourceMap = this.merge(other) { owned, otherValue ->
+        (owned ?: 0) + (otherValue ?: 0)
+    }
+
+    override fun minus(other: ResourceMap): ResourceMap = this.merge(other) { owned, otherValue ->
+        (owned ?: 0) - (otherValue ?: 0)
+    }
+
+    override fun times(value: Int): ResourceMap = this.map { it.resource to it.value * value }
+
+    override fun has(resource: GameResource, value: Int): Boolean = this.getOrDefault(resource) >= value
+
+    override fun has(resources: ResourceMap): Boolean = this.resources.all { it.value.value >= resources.getOrDefault(it.key) }
+
+    override fun resources(): Set<GameResource> = this.resources.keys.toSet()
+    override fun entries(): Set<ResourceEntry> = this.resources.values.toSet()
+
+    override fun merge(other: ResourceMap, merger: (owned: Int?, otherValue: Int?) -> Int): ResourceMap {
+        val allResources = this.resources() + other.resources()
+        return ResourceMapImpl(allResources.associateWith { resource ->
+            ResourceEntryImpl(resource, merger.invoke(this[resource], other[resource]))
+        }.toMutableMap())
+    }
+
+    override fun map(function: (ResourceEntry) -> Pair<GameResource, Int>): ResourceMap {
+        return ResourceMapImpl(this.resources.entries.associate { entry ->
+            function.invoke(entry.value).let { it.first to ResourceEntryImpl(it.first, it.second) }
+        }.toMutableMap())
+    }
+
+    override fun filter(function: (ResourceEntry) -> Boolean): ResourceMap {
+        return ResourceMapImpl(this.resources.filter { function.invoke(it.value) }.toMutableMap())
+    }
+
+    override fun <R> fold(initial: R, operation: (acc: R, ResourceEntry) -> R): R {
+        return entries().fold(initial, operation)
+    }
+
+    override fun unaryMinus(): ResourceMap = this.map { it.resource to -it.value }
+
+}
+
diff --git a/games-dsl/common/src/main/kotlin/net/zomis/games/components/resources/ResourceModifiers.kt b/games-dsl/common/src/main/kotlin/net/zomis/games/components/resources/ResourceModifiers.kt
new file mode 100644
index 00000000..ac001fe1
--- /dev/null
+++ b/games-dsl/common/src/main/kotlin/net/zomis/games/components/resources/ResourceModifiers.kt
@@ -0,0 +1,15 @@
+package net.zomis.games.components.resources
+
+interface ResourceModifier {
+    val resource: GameResource
+    val priority: Int
+    val description: Any?
+    val activeCondition: () -> Boolean
+    val modifier: (Int) -> Int
+}
+
+interface ModifiableResourceMap {
+    fun hasModified(resources: ResourceMap): Boolean
+    fun hasModified(resource: GameResource, value: Int): Boolean
+    fun getModified(resource: GameResource): Int
+}
diff --git a/games-dsl/common/src/main/kotlin/net/zomis/games/components/resources/Resources.kt b/games-dsl/common/src/main/kotlin/net/zomis/games/components/resources/Resources.kt
new file mode 100644
index 00000000..dbfe2e2d
--- /dev/null
+++ b/games-dsl/common/src/main/kotlin/net/zomis/games/components/resources/Resources.kt
@@ -0,0 +1,11 @@
+package net.zomis.games.components.resources
+
+interface GameResource {
+    fun defaultValue(): Int = 0
+    fun toResourceMap(value: Int = 1): ResourceMap = TODO()
+    operator fun plus(other: GameResource): ResourceMap = this.toResourceMap().plus(other.toResourceMap())
+    operator fun times(value: Int): ResourceMap = this.toResourceMap(value)
+}
+
+object Resources {
+}
\ No newline at end of file