diff --git a/app/build.gradle.kts b/app/build.gradle.kts
index 7955114..cb00d02 100644
--- a/app/build.gradle.kts
+++ b/app/build.gradle.kts
@@ -11,8 +11,8 @@ android {
         applicationId = "solutions.tretter.githugandroid"
         minSdk = 26
         targetSdk = 34
-        versionCode = 78
-        versionName = "0.1.77"
+        versionCode = 79
+        versionName = "0.1.78"
 
         testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
         vectorDrawables.useSupportLibrary = true
diff --git a/app/src/main/java/solutions/tretter/githugandroid/GitRuntime.kt b/app/src/main/java/solutions/tretter/githugandroid/GitRuntime.kt
index bb1fb9c..f09be05 100644
--- a/app/src/main/java/solutions/tretter/githugandroid/GitRuntime.kt
+++ b/app/src/main/java/solutions/tretter/githugandroid/GitRuntime.kt
@@ -182,6 +182,16 @@ class GitRepositoryRuntime(private val context: Context) {
         val tagResult = runGit(nativeGit, sandbox, listOf("tag", "--list"))
         val remoteResult = runGit(nativeGit, sandbox, listOf("remote", "-v"))
         val headResult = runGit(nativeGit, sandbox, listOf("branch", "--show-current"))
+        val userNameResult = runGit(nativeGit, sandbox, listOf("config", "--get", "user.name"))
+        val userEmailResult = runGit(nativeGit, sandbox, listOf("config", "--get", "user.email"))
+        val config = buildMap {
+            userNameResult.outputLines.firstOrNull()?.takeIf { it.isNotBlank() }?.let { put("user.name", it) }
+            userEmailResult.outputLines.firstOrNull()?.takeIf { it.isNotBlank() }?.let { put("user.email", it) }
+        }
+        AppLog.d(
+            "GitRuntime",
+            "inspectSandbox level=${level.id} config=$config user.name.exit=${userNameResult.exitCode} user.email.exit=${userEmailResult.exitCode}",
+        )
         val commits = if (logResult.exitCode == 0) {
             logResult.outputLines.filter { it.isNotBlank() }.mapNotNull { line ->
                 val parts = line.split('\t', limit = 2)
@@ -210,6 +220,7 @@ class GitRepositoryRuntime(private val context: Context) {
                 val parts = line.trim().split(Regex("\\s+"))
                 if (parts.size >= 2) parts[0] to parts[1] else null
             }.toMap(),
+            config = config,
         )
     }
 
diff --git a/app/src/main/java/solutions/tretter/githugandroid/levels/CoreLevels.kt b/app/src/main/java/solutions/tretter/githugandroid/levels/CoreLevels.kt
index be72c50..e32dee9 100644
--- a/app/src/main/java/solutions/tretter/githugandroid/levels/CoreLevels.kt
+++ b/app/src/main/java/solutions/tretter/githugandroid/levels/CoreLevels.kt
@@ -18,7 +18,21 @@ internal fun coreLevels(): List<Level> = listOf(
         commandSuggestions = listOf("git config user.name GitHug", "git config user.email githug@example.com"),
         setup = { RepoState(initialized = true, branches = mapOf("master" to 0)) },
         validator = repoPredicate { repo ->
-            repo.config.containsKey("user.name") && repo.config.containsKey("user.email")
+            val hasUserName = repo.config.containsKey("user.name")
+            val observedUserName = repo.config["user.name"]
+            AppLog.d(
+                "Validation",
+                "Config rule key='user.name' expected=defined observed=${observedUserName ?: "<missing>"} passed=$hasUserName",
+            )
+
+            val hasUserEmail = repo.config.containsKey("user.email")
+            val observedUserEmail = repo.config["user.email"]
+            AppLog.d(
+                "Validation",
+                "Config rule key='user.email' expected=defined observed=${observedUserEmail ?: "<missing>"} passed=$hasUserEmail",
+            )
+
+            hasUserName && hasUserEmail
         },
     ),
     level(
diff --git a/app/src/main/java/solutions/tretter/githugandroid/levels/LevelCatalog.kt b/app/src/main/java/solutions/tretter/githugandroid/levels/LevelCatalog.kt
index 2315365..82dd591 100644
--- a/app/src/main/java/solutions/tretter/githugandroid/levels/LevelCatalog.kt
+++ b/app/src/main/java/solutions/tretter/githugandroid/levels/LevelCatalog.kt
@@ -10,11 +10,68 @@ internal fun level(
     commandSuggestions: List<String> = listOf("git status", "git log", "git help"),
     setup: () -> RepoState,
     validator: (RepoState, String) -> Boolean,
-): Level = Level(id, title, description, hints, commandSuggestions, validator, setup)
+): Level = Level(
+    id = id,
+    title = title,
+    description = description,
+    hints = hints,
+    commandSuggestions = commandSuggestions,
+    validator = loggingValidator(id, title, validator),
+    setup = setup,
+)
 
 internal fun commandAnswer(vararg answers: String): (RepoState, String) -> Boolean = { _, command ->
     val normalized = command.trim()
-    answers.any { it.equals(normalized, ignoreCase = true) }
+    val matched = answers.firstOrNull { it.equals(normalized, ignoreCase = true) }
+    AppLog.d(
+        "Validation",
+        "commandAnswer normalized='$normalized' expected=${answers.toList()} matched=${matched != null}",
+    )
+    matched != null
 }
 
-internal fun repoPredicate(block: (RepoState) -> Boolean): (RepoState, String) -> Boolean = { repo, _ -> block(repo) }
\ No newline at end of file
+internal fun repoPredicate(block: (RepoState) -> Boolean): (RepoState, String) -> Boolean = { repo, _ ->
+    block(repo)
+}
+
+private fun loggingValidator(
+    levelId: String,
+    levelTitle: String,
+    validator: (RepoState, String) -> Boolean,
+): (RepoState, String) -> Boolean = { repo, command ->
+    AppLog.d(
+        "Validation",
+        buildString {
+            append("Evaluating level=")
+            append(levelId)
+            append(" title=")
+            append(levelTitle)
+            append(" command='")
+            append(command)
+            append("' repo=")
+            append(repo.validationSnapshot())
+        },
+    )
+    val result = validator(repo, command)
+    AppLog.d("Validation", "Result level=$levelId passed=$result")
+    result
+}
+
+private fun RepoState.validationSnapshot(): String = buildString {
+    append("initialized=")
+    append(initialized)
+    append(", headBranch=")
+    append(headBranch)
+    append(", branches=")
+    append(branches.keys.sorted())
+    append(", tags=")
+    append(tags.sorted())
+    append(", remotes=")
+    append(remotes.toSortedMap())
+    append(", config=")
+    append(config.toSortedMap())
+    append(", files=")
+    append(files.map { file -> "${file.name}(staged=${file.staged},tracked=${file.tracked})" }.sorted())
+    append(", commits=")
+    append(commits.map { it.id to it.message })
+}
\ No newline at end of file