diff --git a/build.gradle.kts b/build.gradle.kts
index 26cc008..af0a95e 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -35,7 +35,7 @@ kotlin {
 
 kotlin {
     jvmToolchain {
-        languageVersion = JavaLanguageVersion.of(25)
+        languageVersion = JavaLanguageVersion.of(21)
         vendor = JvmVendorSpec.ADOPTIUM
     }
 }
diff --git a/gradle/libs.versions.toml b/gradle/libs.versions.toml
index 8c2419b..0aa6002 100644
--- a/gradle/libs.versions.toml
+++ b/gradle/libs.versions.toml
@@ -23,7 +23,7 @@ mockk = "1.14.9" # https://mvnrepository.com/artifact/io.mockk/mockk
 
 kotlin-reflect = { group = "org.jetbrains.kotlin", name = "kotlin-reflect", version.ref = "kotlin" }
 
-memoize = {group = "org.duckdns.davygora", name = "memoize", version.ref="memoize"}
+memoize = { group = "org.duckdns.davygora", name = "memoize", version.ref = "memoize" }
 
 # Test
 
diff --git a/src/main/kotlin/org/duckdns/davygora/matrix/AbstractMatrix.kt b/src/main/kotlin/org/duckdns/davygora/matrix/AbstractMatrix.kt
new file mode 100644
index 0000000..85d7b88
--- /dev/null
+++ b/src/main/kotlin/org/duckdns/davygora/matrix/AbstractMatrix.kt
@@ -0,0 +1,34 @@
+package org.duckdns.davygora.matrix
+
+import org.duckdns.davygora.matrix.storage.MatrixStorage
+
+abstract class AbstractMatrix<T>(
+    override val xSize: Int,
+    override val ySize: Int,
+    protected val matrix: MatrixStorage<T>,
+) : Matrix<T> {
+    override fun toString(): String =
+        (0..<ySize)
+            .map { y ->
+                "[\t${(0..<xSize).joinToString("\t") { x -> this[x, y].toString() }}\t]"
+            }.joinToString { "\n" }
+
+    override fun equals(other: Any?): Boolean {
+        if (this === other) return true
+        if (javaClass != other?.javaClass) return false
+
+        other as AbstractMatrix<T>
+
+        if (xSize != other.xSize) return false
+        if (ySize != other.ySize) return false
+        if (matrix != other.matrix) return false
+        return true
+    }
+
+    override fun hashCode(): Int {
+        var result = xSize
+        result = 31 * result + ySize
+        result = 31 * result + matrix.hashCode()
+        return result
+    }
+}
diff --git a/src/main/kotlin/org/duckdns/davygora/matrix/AbstractMutableMatrix.kt b/src/main/kotlin/org/duckdns/davygora/matrix/AbstractMutableMatrix.kt
new file mode 100644
index 0000000..8ddea6e
--- /dev/null
+++ b/src/main/kotlin/org/duckdns/davygora/matrix/AbstractMutableMatrix.kt
@@ -0,0 +1,10 @@
+package org.duckdns.davygora.matrix
+
+import org.duckdns.davygora.matrix.storage.MatrixStorage
+
+abstract class AbstractMutableMatrix<T>(
+    xSize: Int,
+    ySize: Int,
+    matrix: MatrixStorage<T>,
+) : AbstractMatrix<T>(xSize, ySize, matrix),
+    MutableMatrix<T>
diff --git a/src/main/kotlin/org/duckdns/davygora/matrix/Matrix.kt b/src/main/kotlin/org/duckdns/davygora/matrix/Matrix.kt
new file mode 100644
index 0000000..4d3fcb9
--- /dev/null
+++ b/src/main/kotlin/org/duckdns/davygora/matrix/Matrix.kt
@@ -0,0 +1,11 @@
+package org.duckdns.davygora.matrix
+
+interface Matrix<T> {
+    val xSize: Int
+    val ySize: Int
+
+    operator fun get(
+        x: Int,
+        y: Int,
+    ): T
+}
diff --git a/src/main/kotlin/org/duckdns/davygora/matrix/MutableMatrix.kt b/src/main/kotlin/org/duckdns/davygora/matrix/MutableMatrix.kt
new file mode 100644
index 0000000..7261763
--- /dev/null
+++ b/src/main/kotlin/org/duckdns/davygora/matrix/MutableMatrix.kt
@@ -0,0 +1,9 @@
+package org.duckdns.davygora.matrix
+
+interface MutableMatrix<T> : Matrix<T> {
+    operator fun set(
+        x: Int,
+        y: Int,
+        value: T,
+    )
+}
diff --git a/src/main/kotlin/org/duckdns/davygora/matrix/exception/MatrixCoordinateOutOfRangeException.kt b/src/main/kotlin/org/duckdns/davygora/matrix/exception/MatrixCoordinateOutOfRangeException.kt
new file mode 100644
index 0000000..8b5d0d5
--- /dev/null
+++ b/src/main/kotlin/org/duckdns/davygora/matrix/exception/MatrixCoordinateOutOfRangeException.kt
@@ -0,0 +1,7 @@
+package org.duckdns.davygora.matrix.exception
+
+class MatrixCoordinateOutOfRangeException(
+    coordName: Char,
+    coord: Int,
+    maxCoord: Int,
+) : MatrixException("${coordName.uppercaseChar()} coordinate $coord is out of range, allowed is 0..$maxCoord")
diff --git a/src/main/kotlin/org/duckdns/davygora/matrix/exception/MatrixException.kt b/src/main/kotlin/org/duckdns/davygora/matrix/exception/MatrixException.kt
new file mode 100644
index 0000000..8ffddd3
--- /dev/null
+++ b/src/main/kotlin/org/duckdns/davygora/matrix/exception/MatrixException.kt
@@ -0,0 +1,6 @@
+package org.duckdns.davygora.matrix.exception
+
+sealed class MatrixException(
+    message: String,
+    cause: Throwable? = null,
+) : RuntimeException(message, cause)
diff --git a/src/main/kotlin/org/duckdns/davygora/matrix/exception/MatrixInvalidSizeException.kt b/src/main/kotlin/org/duckdns/davygora/matrix/exception/MatrixInvalidSizeException.kt
new file mode 100644
index 0000000..d8deb5d
--- /dev/null
+++ b/src/main/kotlin/org/duckdns/davygora/matrix/exception/MatrixInvalidSizeException.kt
@@ -0,0 +1,6 @@
+package org.duckdns.davygora.matrix.exception
+
+class MatrixInvalidSizeException(
+    coordinate: Char,
+    size: Int,
+) : MatrixException("${coordinate.uppercaseChar()} size is invalid: $size (should be > 0)")
diff --git a/src/main/kotlin/org/duckdns/davygora/matrix/exception/MatrixSizeMismatchException.kt b/src/main/kotlin/org/duckdns/davygora/matrix/exception/MatrixSizeMismatchException.kt
new file mode 100644
index 0000000..9847ed1
--- /dev/null
+++ b/src/main/kotlin/org/duckdns/davygora/matrix/exception/MatrixSizeMismatchException.kt
@@ -0,0 +1,6 @@
+package org.duckdns.davygora.matrix.exception
+
+class MatrixSizeMismatchException(
+    expectedSize: Int,
+    actualSize: Int,
+) : MatrixException("Matrix size mismatch: expected $expectedSize, actual $actualSize")
diff --git a/src/main/kotlin/org/duckdns/davygora/matrix/impl/ArrayMatrix.kt b/src/main/kotlin/org/duckdns/davygora/matrix/impl/ArrayMatrix.kt
new file mode 100644
index 0000000..5dc8fe2
--- /dev/null
+++ b/src/main/kotlin/org/duckdns/davygora/matrix/impl/ArrayMatrix.kt
@@ -0,0 +1,57 @@
+package org.duckdns.davygora.matrix.impl
+
+import org.duckdns.davygora.matrix.AbstractMutableMatrix
+import org.duckdns.davygora.matrix.Matrix
+import org.duckdns.davygora.matrix.exception.MatrixCoordinateOutOfRangeException
+import org.duckdns.davygora.matrix.exception.MatrixInvalidSizeException
+import org.duckdns.davygora.matrix.exception.MatrixNotRectangularException
+import org.duckdns.davygora.matrix.exception.MatrixSizeMismatchException
+import org.duckdns.davygora.matrix.storage.MatrixStorage
+import org.duckdns.davygora.memoize.memoize
+
+class ArrayMatrix<T>(
+    xSize: Int,
+    ySize: Int,
+    matrix: MatrixStorage<T>,
+) : AbstractMutableMatrix<T>(xSize, ySize, matrix) {
+    private val size = xSize * ySize
+
+    private val maxX = xSize - 1
+    private val maxY = ySize - 1
+
+    init {
+        if (ySize < 1) throw MatrixInvalidSizeException('y', ySize)
+        if (xSize < 1) throw MatrixInvalidSizeException('x', xSize)
+        if (size != matrix.size) throw MatrixSizeMismatchException(size, matrix.size)
+    }
+
+    override operator fun get(
+        x: Int,
+        y: Int,
+    ): T = matrix[index(x, y)]
+
+    override operator fun set(
+        x: Int,
+        y: Int,
+        value: T,
+    ) {
+        matrix[index(x, y)] = value
+    }
+
+    private val index = { x: Int, y: Int -> validateY(y) * xSize + validateX(x) }.memoize()
+
+    private val validateX = { x: Int -> validateCoord('x', x, maxX) }.memoize()
+    private val validateY = { y: Int -> validateCoord('y', y, maxY) }.memoize()
+
+    private fun validateCoord(
+        coordName: Char,
+        coord: Int,
+        maxCoord: Int,
+    ) = if (coord in
+        0..maxCoord
+    ) {
+        coord
+    } else {
+        throw MatrixCoordinateOutOfRangeException(coordName, coord, maxCoord)
+    }
+}
diff --git a/src/main/kotlin/org/duckdns/davygora/matrix/storage/BooleanStorage.kt b/src/main/kotlin/org/duckdns/davygora/matrix/storage/BooleanStorage.kt
new file mode 100644
index 0000000..6243d0b
--- /dev/null
+++ b/src/main/kotlin/org/duckdns/davygora/matrix/storage/BooleanStorage.kt
@@ -0,0 +1,19 @@
+package org.duckdns.davygora.matrix.storage
+
+@JvmInline
+value class BooleanStorage(
+    val data: BooleanArray,
+) : MatrixStorage<Boolean> {
+    override val size get() = data.size
+
+    override operator fun get(index: Int) = data[index]
+
+    override fun set(
+        index: Int,
+        value: Boolean,
+    ) {
+        data[index] = value
+    }
+
+    override fun toString(): String = data.contentToString()
+}
diff --git a/src/main/kotlin/org/duckdns/davygora/matrix/storage/ByteStorage.kt b/src/main/kotlin/org/duckdns/davygora/matrix/storage/ByteStorage.kt
new file mode 100644
index 0000000..21dd502
--- /dev/null
+++ b/src/main/kotlin/org/duckdns/davygora/matrix/storage/ByteStorage.kt
@@ -0,0 +1,19 @@
+package org.duckdns.davygora.matrix.storage
+
+@JvmInline
+value class ByteStorage(
+    val data: ByteArray,
+) : MatrixStorage<Byte> {
+    override val size get() = data.size
+
+    override operator fun get(index: Int) = data[index]
+
+    override fun set(
+        index: Int,
+        value: Byte,
+    ) {
+        data[index] = value
+    }
+
+    override fun toString(): String = data.contentToString()
+}
diff --git a/src/main/kotlin/org/duckdns/davygora/matrix/storage/CharStorage.kt b/src/main/kotlin/org/duckdns/davygora/matrix/storage/CharStorage.kt
new file mode 100644
index 0000000..52dd8ed
--- /dev/null
+++ b/src/main/kotlin/org/duckdns/davygora/matrix/storage/CharStorage.kt
@@ -0,0 +1,19 @@
+package org.duckdns.davygora.matrix.storage
+
+@JvmInline
+value class CharStorage(
+    val data: CharArray,
+) : MatrixStorage<Char> {
+    override val size get() = data.size
+
+    override operator fun get(index: Int) = data[index]
+
+    override fun set(
+        index: Int,
+        value: Char,
+    ) {
+        data[index] = value
+    }
+
+    override fun toString(): String = data.contentToString()
+}
diff --git a/src/main/kotlin/org/duckdns/davygora/matrix/storage/DoubleStorage.kt b/src/main/kotlin/org/duckdns/davygora/matrix/storage/DoubleStorage.kt
new file mode 100644
index 0000000..7ed8d3f
--- /dev/null
+++ b/src/main/kotlin/org/duckdns/davygora/matrix/storage/DoubleStorage.kt
@@ -0,0 +1,19 @@
+package org.duckdns.davygora.matrix.storage
+
+@JvmInline
+value class DoubleStorage(
+    val data: DoubleArray,
+) : MatrixStorage<Double> {
+    override val size get() = data.size
+
+    override operator fun get(index: Int) = data[index]
+
+    override fun set(
+        index: Int,
+        value: Double,
+    ) {
+        data[index] = value
+    }
+
+    override fun toString(): String = data.contentToString()
+}
diff --git a/src/main/kotlin/org/duckdns/davygora/matrix/storage/FloatStorage.kt b/src/main/kotlin/org/duckdns/davygora/matrix/storage/FloatStorage.kt
new file mode 100644
index 0000000..bde36c9
--- /dev/null
+++ b/src/main/kotlin/org/duckdns/davygora/matrix/storage/FloatStorage.kt
@@ -0,0 +1,19 @@
+package org.duckdns.davygora.matrix.storage
+
+@JvmInline
+value class FloatStorage(
+    val data: FloatArray,
+) : MatrixStorage<Float> {
+    override val size get() = data.size
+
+    override operator fun get(index: Int) = data[index]
+
+    override fun set(
+        index: Int,
+        value: Float,
+    ) {
+        data[index] = value
+    }
+
+    override fun toString(): String = data.contentToString()
+}
diff --git a/src/main/kotlin/org/duckdns/davygora/matrix/storage/IntStorage.kt b/src/main/kotlin/org/duckdns/davygora/matrix/storage/IntStorage.kt
new file mode 100644
index 0000000..ca3cd7b
--- /dev/null
+++ b/src/main/kotlin/org/duckdns/davygora/matrix/storage/IntStorage.kt
@@ -0,0 +1,19 @@
+package org.duckdns.davygora.matrix.storage
+
+@JvmInline
+value class IntStorage(
+    val data: IntArray,
+) : MatrixStorage<Int> {
+    override val size get() = data.size
+
+    override operator fun get(index: Int) = data[index]
+
+    override fun set(
+        index: Int,
+        value: Int,
+    ) {
+        data[index] = value
+    }
+
+    override fun toString(): String = data.contentToString()
+}
diff --git a/src/main/kotlin/org/duckdns/davygora/matrix/storage/LongStorage.kt b/src/main/kotlin/org/duckdns/davygora/matrix/storage/LongStorage.kt
new file mode 100644
index 0000000..e1fe2ce
--- /dev/null
+++ b/src/main/kotlin/org/duckdns/davygora/matrix/storage/LongStorage.kt
@@ -0,0 +1,19 @@
+package org.duckdns.davygora.matrix.storage
+
+@JvmInline
+value class LongStorage(
+    val data: LongArray,
+) : MatrixStorage<Long> {
+    override val size get() = data.size
+
+    override operator fun get(index: Int) = data[index]
+
+    override fun set(
+        index: Int,
+        value: Long,
+    ) {
+        data[index] = value
+    }
+
+    override fun toString(): String = data.contentToString()
+}
diff --git a/src/main/kotlin/org/duckdns/davygora/matrix/storage/MatrixStorage.kt b/src/main/kotlin/org/duckdns/davygora/matrix/storage/MatrixStorage.kt
new file mode 100644
index 0000000..db672aa
--- /dev/null
+++ b/src/main/kotlin/org/duckdns/davygora/matrix/storage/MatrixStorage.kt
@@ -0,0 +1,12 @@
+package org.duckdns.davygora.matrix.storage
+
+sealed interface MatrixStorage<T> {
+    val size: Int
+
+    operator fun get(index: Int): T
+
+    operator fun set(
+        index: Int,
+        value: T,
+    )
+}
diff --git a/src/main/kotlin/org/duckdns/davygora/matrix/storage/ObjectStorage.kt b/src/main/kotlin/org/duckdns/davygora/matrix/storage/ObjectStorage.kt
new file mode 100644
index 0000000..964af74
--- /dev/null
+++ b/src/main/kotlin/org/duckdns/davygora/matrix/storage/ObjectStorage.kt
@@ -0,0 +1,19 @@
+package org.duckdns.davygora.matrix.storage
+
+@JvmInline
+value class ObjectStorage<T>(
+    val data: Array<T>,
+) : MatrixStorage<T> {
+    override val size get() = data.size
+
+    override operator fun get(index: Int) = data[index]
+
+    override fun set(
+        index: Int,
+        value: T,
+    ) {
+        data[index] = value
+    }
+
+    override fun toString(): String = data.contentToString()
+}
diff --git a/src/main/kotlin/org/duckdns/davygora/matrix/storage/ShortStorage.kt b/src/main/kotlin/org/duckdns/davygora/matrix/storage/ShortStorage.kt
new file mode 100644
index 0000000..9cbf877
--- /dev/null
+++ b/src/main/kotlin/org/duckdns/davygora/matrix/storage/ShortStorage.kt
@@ -0,0 +1,19 @@
+package org.duckdns.davygora.matrix.storage
+
+@JvmInline
+value class ShortStorage(
+    val data: ShortArray,
+) : MatrixStorage<Short> {
+    override val size get() = data.size
+
+    override operator fun get(index: Int) = data[index]
+
+    override fun set(
+        index: Int,
+        value: Short,
+    ) {
+        data[index] = value
+    }
+
+    override fun toString(): String = data.contentToString()
+}