diff --git a/src/xminigrid/__init__.py b/src/xminigrid/__init__.py
index 507be7c..f57ecbe 100644
--- a/src/xminigrid/__init__.py
+++ b/src/xminigrid/__init__.py
@@ -90,6 +90,14 @@
     width=9,
 )
 
+register(
+    id="XLand-MiniGrid-R1-11x11",
+    entry_point="xminigrid.envs.xland:XLandMiniGrid",
+    grid_type="R1",
+    height=11,
+    width=11,
+)
+
 register(
     id="XLand-MiniGrid-R1-13x13",
     entry_point="xminigrid.envs.xland:XLandMiniGrid",
@@ -98,6 +106,14 @@
     width=13,
 )
 
+register(
+    id="XLand-MiniGrid-R1-15x15",
+    entry_point="xminigrid.envs.xland:XLandMiniGrid",
+    grid_type="R1",
+    height=15,
+    width=15,
+)
+
 register(
     id="XLand-MiniGrid-R1-17x17",
     entry_point="xminigrid.envs.xland:XLandMiniGrid",
@@ -115,6 +131,14 @@
     width=9,
 )
 
+register(
+    id="XLand-MiniGrid-R2-11x11",
+    entry_point="xminigrid.envs.xland:XLandMiniGrid",
+    grid_type="R2",
+    height=11,
+    width=11,
+)
+
 register(
     id="XLand-MiniGrid-R2-13x13",
     entry_point="xminigrid.envs.xland:XLandMiniGrid",
@@ -123,6 +147,14 @@
     width=13,
 )
 
+register(
+    id="XLand-MiniGrid-R2-15x15",
+    entry_point="xminigrid.envs.xland:XLandMiniGrid",
+    grid_type="R2",
+    height=15,
+    width=15,
+)
+
 register(
     id="XLand-MiniGrid-R2-17x17",
     entry_point="xminigrid.envs.xland:XLandMiniGrid",
@@ -140,6 +172,14 @@
     width=9,
 )
 
+register(
+    id="XLand-MiniGrid-R4-11x11",
+    entry_point="xminigrid.envs.xland:XLandMiniGrid",
+    grid_type="R4",
+    height=11,
+    width=11,
+)
+
 register(
     id="XLand-MiniGrid-R4-13x13",
     entry_point="xminigrid.envs.xland:XLandMiniGrid",
@@ -148,6 +188,14 @@
     width=13,
 )
 
+register(
+    id="XLand-MiniGrid-R4-15x15",
+    entry_point="xminigrid.envs.xland:XLandMiniGrid",
+    grid_type="R4",
+    height=15,
+    width=15,
+)
+
 register(
     id="XLand-MiniGrid-R4-17x17",
     entry_point="xminigrid.envs.xland:XLandMiniGrid",
diff --git a/src/xminigrid/envs/xland.py b/src/xminigrid/envs/xland.py
index 1cf7b82..ad26649 100644
--- a/src/xminigrid/envs/xland.py
+++ b/src/xminigrid/envs/xland.py
@@ -151,7 +151,7 @@ def default_params(self, **kwargs) -> XLandEnvParams:
             # this is just a heuristic to prevent brute force in one episode,
             # so that agent need to remember what he tried in previous episodes.
             # If this is too small, change it or increase number of trials (NB: these are not equivalent).
-            params = params.replace(max_steps=4 * (params.height * params.width))
+            params = params.replace(max_steps=3 * (params.height * params.width))
         return params
 
     def _generate_problem(self, params: XLandEnvParams, key: jax.Array) -> State[EnvCarry]: