diff --git a/__tests__/config.test.ts b/__tests__/config.test.ts
index 9ea14fa..69590ca 100644
--- a/__tests__/config.test.ts
+++ b/__tests__/config.test.ts
@@ -78,6 +78,7 @@ afterEach(() => {
   delete process.env["INPUT_IGNORE_EMPTY"]
   delete process.env["INPUT_SKIP_UNCHANGED"]
   delete process.env["INPUT_FOLLOW_SYMBOLIC_LINKS"]
+  delete process.env["INPUT_NUMBER_FORCE"]
 })
 
 test("repo", async () => {
@@ -428,3 +429,26 @@ test("skip_unchanged", async () => {
   })
   expect(await config.getBody()).toEqual("")
 })
+
+test("number_force", async () => {
+  process.env["INPUT_NUMBER_FORCE"] = "456"
+  mockConfig.pullRequestNumber = 456
+
+  const config = await import('../src/config')
+  expect(config).toMatchObject({
+    pullRequestNumber: 456,
+    repo: {owner: "marocchino", repo: "stick-pull-request-comment"},
+    header: "",
+    append: false,
+    recreate: false,
+    deleteOldComment: false,
+    hideOldComment: false,
+    hideAndRecreate: false,
+    hideClassify: "OUTDATED",
+    hideDetails: false,
+    githubToken: "some-token",
+    ignoreEmpty: false,
+    skipUnchanged: false
+  })
+  expect(await config.getBody()).toEqual("")
+})
diff --git a/__tests__/pullRequestNumber.test.ts b/__tests__/pullRequestNumber.test.ts
new file mode 100644
index 0000000..5a15383
--- /dev/null
+++ b/__tests__/pullRequestNumber.test.ts
@@ -0,0 +1,86 @@
+import {afterEach, describe, expect, test, vi} from "vitest"
+
+const mockGetInput = vi.fn().mockReturnValue("")
+
+vi.mock("@actions/core", () => ({
+  getInput: mockGetInput,
+  getBooleanInput: vi.fn().mockReturnValue(false),
+  getMultilineInput: vi.fn().mockReturnValue([]),
+  setFailed: vi.fn(),
+  info: vi.fn(),
+}))
+
+const mockContext: {payload: Record<string, unknown>; repo: {owner: string; repo: string}} = {
+  payload: {},
+  repo: {owner: "marocchino", repo: "sticky-pull-request-comment"},
+}
+
+vi.mock("@actions/github", () => ({
+  context: mockContext,
+}))
+
+vi.mock("@actions/glob", () => ({
+  create: vi.fn(),
+}))
+
+afterEach(() => {
+  vi.resetModules()
+  mockContext.payload = {}
+  mockGetInput.mockReturnValue("")
+})
+
+describe("pullRequestNumber priority", () => {
+  test("uses number_force when set, overriding pull_request event number", async () => {
+    mockContext.payload = {pull_request: {number: 100}}
+    mockGetInput.mockImplementation((name: string) => {
+      if (name === "number_force") return "999"
+      if (name === "number") return "200"
+      return ""
+    })
+
+    const {pullRequestNumber} = await import("../src/config")
+    expect(pullRequestNumber).toBe(999)
+  })
+
+  test("uses number_force when set, overriding number input", async () => {
+    mockContext.payload = {}
+    mockGetInput.mockImplementation((name: string) => {
+      if (name === "number_force") return "999"
+      if (name === "number") return "200"
+      return ""
+    })
+
+    const {pullRequestNumber} = await import("../src/config")
+    expect(pullRequestNumber).toBe(999)
+  })
+
+  test("uses pull_request event number when number_force is not set", async () => {
+    mockContext.payload = {pull_request: {number: 100}}
+    mockGetInput.mockImplementation((name: string) => {
+      if (name === "number") return "200"
+      return ""
+    })
+
+    const {pullRequestNumber} = await import("../src/config")
+    expect(pullRequestNumber).toBe(100)
+  })
+
+  test("uses number input when number_force and pull_request event number are not set", async () => {
+    mockContext.payload = {}
+    mockGetInput.mockImplementation((name: string) => {
+      if (name === "number") return "200"
+      return ""
+    })
+
+    const {pullRequestNumber} = await import("../src/config")
+    expect(pullRequestNumber).toBe(200)
+  })
+
+  test("returns 0 when none of number_force, pull_request number, or number are set", async () => {
+    mockContext.payload = {}
+    mockGetInput.mockReturnValue("")
+
+    const {pullRequestNumber} = await import("../src/config")
+    expect(pullRequestNumber).toBe(0)
+  })
+})